⚜ SteamCozy

Home / Games / Ammossum

Ammossum

Ammossum

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?

Released Sep 28, 2026 Developer West Glade Publisher Yahaha Games Platforms Windows RoguelikeSingleplayerReplay ValueAction-AdventureAction Roguelike
View on Steam ↗ $12.99 (US · as of 2026-10-16)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-10-11 · quoted reviews as of 2026-09-30.

68.8%positive125 reviews
Recommended · 9 found this helpful

“Great game. Upgrading stuff makes me curious of builds so it does keep you playing.”

— a player, Steam review · 1 hrs played
Recommended · 4 found this helpful

“Played on steam deck. Found mouse and keyboard controls better than the gamepad supported ones; lil clumsy. Gameplay is overall fun. Balance seems off imo. An example is the bow, single shot and slow reload with no base pass thru. Losing 3-4 levels in because you can't shoot…”

— a player, Steam review · 5 hrs played
Not recommended · 14 found this helpful

“It's fun but has some serious flaws. Half way through a run you are either dead or you are so strong you don't need to move. It's a bit confusing, specially when linking items to train cars and to each other. The sound design feels weird, there's no impact to your shots are…”

— a player, Steam review · 4 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-10-16.

91achievements
8.1%median completion
0.1%rarest: Dam problem
71.1% of players 52.8% of players 51.9% of players 45.0% of players 39.9% of players 39.3% of players 38.6% of players 36.5% of players 36.4% of players 35.4% of players 34.6% of players 34.1% of players 33.9% of players 28.5% of players 27.9% of players 27.3% of players 27.1% of players 25.6% of players 23.7% of players 22.9% of players 22.5% of players 22.1% of players 21.6% of players 21.4% of players 20.0% of players 18.7% of players 18.2% of players 16.9% of players 16.5% of players 16.0% of players 15.7% of players 15.5% of players 15.4% of players 14.9% of players 14.6% of players 14.2% of players 14.2% of players 13.9% of players 13.0% of players 11.6% of players 11.4% of players 10.3% of players 9.6% of players 9.5% of players 9.0% of players 8.1% of players 8.1% of players 7.7% of players 7.6% of players 7.5% of players 7.1% of players 6.6% of players 6.5% of players 6.2% of players 5.4% of players 5.2% of players 5.0% of players 5.0% of players 4.9% of players 4.8% of players 71.1% 0% most earned rarest
Almost everyone has
71.1%Stick around — Collect all items from the Branch branch
52.8%Dentist’s nightmare — Collect all items from the Tooth branch
51.9%My new big friend — Defeat the Bear
Rarest badges of honor
0.1%Dam problem — Defeat 15000 Beavers
0.2%Shell we dance? — Defeat 2500 Snails
0.2%Fresh air at last — Defeat 25000 Skunks

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-09-30. Steam prices vary by region — always confirm your local price on Steam.

$12.99current · sampled 2026-10-16 11:27 UTC
$10.26lowest since tracking began2026-09-30
US12.99 USD
EU10.99 EUR
UK8.79 GBP
Australia17.50 AUD
Canada14.49 CAD
Japan1,300 JPY
Brazil32.75 BRL
China42.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

China≈$6.3 Brazil Japan Canada UK Australia EU US≈$13

Cheapest → most expensive, converted to USD at ECB reference rates (2026-10-16). Relative comparison only.

$0 $10 $20 09-30 10-03 10-06 10-09 10-13 10-16

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Oct 16, 2026
1.0.0.91 Update

Update 1.0.0.91 are here! Big Stack achievements now correctly count chips of all levels Fixed an issue where enemy-kill achievements could sometimes stop progressing Added minimum caps for enemy HP a

Oct 13, 2026
Hotfix update 1.0.0.9

Update — October 13 Fixed 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 10 Fixes & Improvements Fixed Crossbow behavior at the end of battles — its ability should now work correctly Further optimized projectile physics Added maximum caps to several stats

Oct 06, 2026
Update 1.0.0.7

Endless Mode Until 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 wild

Oct 02, 2026
Hotfix update 1.0.0.6

Update — October 2 Balance Capped the maximum Mushroom Jellyfish radius. Don’t worry, Jellyfish fans — it’s still huge. UI & Inventory Fixed an issue where quick smelting an item from the inventory co

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-30.

GenresAction, Indie
Player tagsRoguelike · Singleplayer · Replay Value · Action-Adventure · Action Roguelike · Physics · Action · Combat · Roguelite · Gun Customization · Side Scroller · Dungeon Crawler (Steam store community voting)
FeaturesSingle-player · Steam Achievements · Full controller support · DualShock Controller Support · DualShock Controller Support · DualSense Controller Support · DualSense Controller Support · Steam Cloud
LanguagesEnglish, Russian, Simplified Chinese, French, Japanese, Norwegian, Portuguese - Brazil, Spanish - Latin America
ControllerFull support
Achievements91
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS *: Windows 7 x64 Processor: Intel Core i3-4160 / AMD FX-4300 Memory: 2 GB RAM Graphics: GeForce GT 640 / Radeon HD 7750 / Intel UHD Graphics 620 DirectX: Version 11 Storage: 2 GB available space