Released Sep 28, 2026 $12.99 Mixed Counts toward your Steam games

Ammossum

By West Glade · published by Yahaha Games

Roguelike Singleplayer Replay Value Action-Adventure Action Roguelike Physics Action Combat RogueliteGun CustomizationSide ScrollerDungeon Crawler

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Followers 1,899

Reviews 104 Mixed

Players now 4 Peak today 4

Followers, 30 days — Not enough history yet

Ammossum is a game tagged Roguelike, Singleplayer and Replay Value by West Glade, released Sep 28, 2026. It has 104 Steam reviews (Mixed). The Steam games most like it include Randotura, Ogre Chambers 2222 and P.A.G. Post Apocalypse Guns.

Build an endlessly upgradable weapon! Evolve projectiles into unstoppable firepower in this action roguelike. Fight through hordes of infected beasts, hunt down the source of the plague, and feel the thrill of bloody shootouts filled with bullets, explosions, and acid. Can you survive the madness?

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<a href="https://launchrivals.com/games/2659600-ammossum"><img src="https://launchrivals.com/games/2659600/badge.png" alt="Ammossum launch date" width="320" height="84"></a>

<a href="https://launchrivals.com/games/2659600-ammossum"><img src="https://launchrivals.com/games/2659600/badge.png?theme=light" alt="Ammossum launch date" width="320" height="84"></a>

Randotura 65% match · Roguelike, Singleplayer, Replay Value
Ogre Chambers 2222 64% match · Roguelike, Singleplayer, Replay Value
P.A.G. Post Apocalypse Guns 64% match · Roguelike, Singleplayer, Action Roguelike
OmniGun 62% match · Roguelike, Action Roguelike, Physics
Phil 62% match · Roguelike, Singleplayer, Replay Value
Between Gods 60% match · Roguelike, Singleplayer, Replay Value
Elementum 60% match · Roguelike, Singleplayer, Replay Value
Steampunk Abyss 59% match · Roguelike, Singleplayer, Action Roguelike
Cats Kill Zombies 59% match · Roguelike, Singleplayer, Replay Value
Crank'N'Gun 59% match · Roguelike, Singleplayer, Action Roguelike

Steam data

Everything Steam lists for Ammossum · record updated 23 hours ago

Steam store

Overview

App ID2659600

Release dateSep 28, 2026

Last change number39951309

Last record update23 hours ago

App type: Game
Developer: West Glade
Publisher: Yahaha Games
Steam profile: Counts toward game count and achievement totals · checked 1 day ago
Technologies: Unity detected

Windows 64-bit

Steam Deck: Playable
Controller: Full support

Single-playerFull controller supportPlayStation controllersXbox controllersPlayStation controller BluetoothSteam CloudSteam AchievementsFamily Sharing

Prices

Price · US$12.99

On sale0 of 41regions right now

Lowest seen · US$12.99Oct 23, 2026

Checked17 hours agoin 41 regions

South Asia (USD)$USD

Every price change is kept from Oct 23, 2026 on. Pick a region below to compare.

Patches

Oct 16, 2026 1.0.0.91 Update
Update 1.0.0.91 are here! Big Stack achievements now correctly count chips of all levelsFixed an issue where enemy-kill achievements could sometimes stop progressingAdded minimum caps for enemy HP and movement speed
Oct 13, 2026 Hotfix update 1.0.0.9
Update — October 13Fixed an issue that could cause a hardlock on the first run. The issue primarily affected players using AMD hardware or Linux
Oct 10, 2026 Hotfix update 1.0.0.8
Update — October 10Fixes & ImprovementsFixed Crossbow behavior at the end of battles — its ability should now work correctlyFurther optimized projectile physicsAdded maximum caps to several stats to prevent crashes, excessive values, and o…
Oct 6, 2026 Update 1.0.0.7
Endless ModeUntil now, Endless Mode didn’t really give your craziest builds a chance to shine. We’ve reworked its difficulty curve — now the game will actually try to fight back and put even the wildest builds to the test! Important: Due t…
Oct 2, 2026 Hotfix update 1.0.0.6
Update — October 2BalanceCapped the maximum Mushroom Jellyfish radius. Don’t worry, Jellyfish fans — it’s still huge.UI & InventoryFixed an issue where quick smelting an item from the inventory could automatically switch to another pageDes…
Oct 1, 2026 1.0.0.54 Hotfix is here
Update 1.0.0.54 are here! Black Screen Issue Resolved (again!)
Oct 1, 2026 1.0.0.52 Hotfix is here
Update 1.0.0.52 are here! Black Screen Issue Resolved
Sep 30, 2026 Hotfix update 1.0.0.5
Update — September 30BalanceShortened the overall run length and rebalanced several progression segmentsEarly-game power-ups now arrive faster, each hero have a combat railcar in starting shopBosses now deal more damage, making skipped bos…
Sep 28, 2026 1.0.0.4 Hotfix is here
Update 1.0.0.4 are here! Mouse sensitivity has been reworked, as some players were experiencing inconsistent mouse movementRailcar sounds now work as intendedThe main menu music no longer changes after a run ends
May 17, 2026 0.9.9.1 Update is here!
Update 0.9.9.1 are here! Added French localizationAdded Portuguese localizationAdded Spanish localizationFixed an issue where enemies would get stuck in the bridge arenaFixed an issue where the second boss would die immediately after the f…
May 8, 2026 On the Edge of Release: 0.9.9.0 Demo Update
You can join the demo through our Steam page. For all the latest news about the game, you’re welcome to join our Discord community! Ammossum v.0.9.9.0First of all, thanks to everyone who participated in our previous playtests, the Steam Ne…
Feb 23, 2026 0.9.7.4 Update is here!
Update 0.9.7.4 are here! Added French localization

Build	Branch	Updated
25981015	public	Oct 16, 2026

Depots

ID	Name	Systems	Size	Download	Manifest
2659601	—	All	268.5 MB	187.2 MB	8400275818973464448

Branch	Build	Updated	Access
public	25981015	Oct 16, 2026	Open

Configuration

Install foldersteamapps/common/Ammossum

Executable	Arguments	Systems	Description
Ammossum.exe		Windows · 64-bit

Space per player953.7 MB

Filesup to 5

Save locations1

Root	Path	Pattern	Systems
WinAppDataLocalLow	WestGlade/Ammossum	SaveData.json	All

Achievements

Achievements910 hidden

Most unlocked71%Stick around

Rarest0.5%Last stop: Hell

Stick around Collect all items from the Branch branch 71%
Dentist’s nightmare Collect all items from the Tooth branch 52.8%
My new big friend Defeat the Bear 52.2%
Odds and ends Collect all items from the Pocket Junk branch 45.3%
Spare parts Collect all items from the Scrap branch 40.3%
Mycologist Collect all items from the Strange Mushroom branch 39.8%
Prickly business Collect all items from the Cactus Ball branch 39%
Armed to the teeth Collect all Shooter railcars 37.1%
Reed the room Collect all items from the Reed branch 37%
Black gold Collect all items from the Coal branch 36.2%
Rock solid Collect all items from the Stone branch 35.3%
Bowling champion Defeat the Big Beaver 34.6%
Stumped Collect all items from the Stump branch 34.2%
Made to order Collect the Mechanic railcar 29.1%
Cut it at the Source Defeat the Source 28.5%
Bone collector Collect all items from the Bone Bullet branch 27.9%
Seasoned hunter Collect all Poacher railcars 27.7%
Full house Collect all Carnie railcars 26.6%

All 91 achievements

Reap the rewards Collect all items from the Hoe branch 24.1%
Deal with the devil Collect the Dark Pact railcar 23.6%
Needlework Collect all items from the Sharpie branch 23.3%
All aboard! Complete a Classic Run 23.1%
Archaeologist Collect all items from the Ancient Coins branch 22.2%
Straight to the point Collect all items from the Arrow branch 21.9%
Freight collector Collect all Cargo railcars 20.8%
A rare collection Collect all Rare Aspects 19.3%
Welcome to the club Collect all items from the Club branch 18.7%
Shrapnel safari Collect all items from the Shrapnel branch 17.6%
Anything but common Collect all Uncommon Aspects 17.1%
Size matters Complete a Tough Run 16.7%
Explosive menagerie Collect all items from the Explosive Bullet branch 16.3%
Master key Collect all items from the Bone Key branch 16%
Full prescription Collect all items from the Pill branch 15.9%
Bottled potential Collect all items from the Alchemist's Arrow branch 15.3%
This town ain't big enough Win a run as the Sheriff 15.2%
Jack of all trades Collect all items from the Toolbox branch 14.8%
Entomologist Collect all items from the Bugs branch 14.7%
Just the basics Collect all Common Aspects 14.6%
Jellyfishing Collect all items from the Mushroom Jellyfish branch 13.5%
Born to hunt Win a run as the Hunter 11.9%
Core values Collect all items from the Core branch 11.9%
Shadow play Collect all items from the Shadow branch 10.8%
A bit of everyone Collect all Heroic Aspects 10.4%
Cascade effect Collect all items from the Cascade branch 10.3%
Things are getting weird Complete a Mutant Run 9.9%
Who's laughing now? Defeat 100 Hyenas 9.9%
Off the rails Complete an Insane Run 8.9%
Laser show Collect all items from the Crystal branch 8.7%
Celestial collector Collect all items from the Cosmic Shard branch 8.3%
All in Win a run as the Gambler 8%
Hammer time! Collect all items from the Hammer branch 8%
Straight shooter Collect all items from the Bullet branch 7.7%
Gentleman's choice Collect all items from the Cane branch 7%
Mad alchemist Collect all Liquids 7%
Bomb squad Collect all items from the Bomb branch 6.7%
Into the Fog Complete a Nightmare Run 5.8%
Mine, all mine! Collect all items from the Mine branch 5.8%
Catch me if you can Win a run as the Traveler 5.7%
The cost of survival Complete a Crisis Run 5.4%
What goes around... Collect all items from the Boomerang branch 5.3%
Gunslinger Collect all items from the Revolver branch 5.2%
High roller Collect all items from the Dice branch 4.7%
Pain is gain Win a run as the Rowdy 4.4%
No more small problems Complete a Deadly Run 4.2%
Anchors aweigh! Collect all items from the Gravity Anchor branch 4.1%
Sharpshooter Collect all items from the Bow branch 4%
Now we're talking Collect all Epic Aspects 3.5%
Defying gravity Collect all items from the Gravity Bullet branch 3.4%
Measure twice, shoot once Win a run as the Gunsmith 3.1%
Shrapnel specialist Collect all items from the Flintlock branch 3%
Nothing to declare Win a run as the Bandit 2.9%
Smooth sailing Win a run as the Sailor 2.7%
Chosen by the Source Win a run as the Adept 2.4%
Complete formula Collect all Alchemist railcars 2.4%
Pocket artillery Collect all items from the Slingshot branch 2.4%
Buy low, win high Win a run as the Banker 2.3%
Ale aboard! Collect 30 Fragile Cargo railcars 2.1%
Take out the trash Defeat 10000 Raccoons 2.1%
The Source provides Complete a Cursed Run 1.7%
Storm chaser Collect all items from the Vortex branch 1.7%
Swamp hound down Defeat 2500 Reptiles 1.5%
What even is that? Defeat 25000 Bugs 1.2%
Event horizon Collect all items from the Gravity Bomb branch 1.1%
Big stack Collect all items from the Chips branch 1.1%
Shell shocked Defeat 2500 Armadillos 0.9%
Frogotten Defeat 10000 Frogs 0.8%
Dam problem Defeat 15000 Beavers 0.7%
Fresh air at last Defeat 25000 Skunks 0.7%
Hope is overrated Complete a Hopeless Run 0.6%
Shell we dance? Defeat 2500 Snails 0.6%
Last stop: Hell Complete a Run into Hell 0.5%

News

Sep 28, 2026 · Community Announcements Ammossum is OUT NOW!
Ammossum is OUT NOW!After four years of development, Ammossum is finally out on Steam! It still feels a little strange to write that. We've spent years building, rebuilding, testing and polishing thi…
Sep 3, 2026 · Community Announcements Ammossum Releases September 28!
Ammossum launches September 28!After years of development, the train is finally ready to leave the station. We've been working hard on the full version of the game, adding new weapons, items, railcar…
Feb 25, 2026 · Community Announcements Ammossum is Joining Steam Next Fest!
Hi everyone — Ammossum is participating in Steam Next Fest from Feb 23 to Mar 2 (PT)!We’d love for you to try the demo, and share it with friends who enjoy roguelikes and build experimentation!🕹️ Abo…
Feb 11, 2026 · Community Announcements Time to change the route! 0.96 and open the demo
You can join the demo through our Steam page. For all the latest news about the game, you’re welcome to join our Discord community! Ammossum v.0.96First of all, thanks to everyone who participated in…

Data from public Steam pages, updated daily; 5 days of history. LaunchRivals is not affiliated with Valve or Steam.

Ammossum

About Ammossum

Steam data

Overview

App info

Platforms

Features

Prices

South Asia (USD)$USD

Americas 10

Europe 5

CIS 4

Asia-Pacific 15

Middle East & Africa 7

Patches

Patch notes

Builds

Depots

Depots

Branches

Configuration

Launch options

Cloud saves

Achievements

Global unlock rate

News