Ammossum

Side-scrolling action roguelike built around a train and evolving ammunition

West Glade · Published by Yahaha Games · Released Sep 28, 2026

Reviews: Mixed; 59% of 104
Recent reviews: Not enough recent
Players: 4; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 1 week ago; Oct 16, 2026
Minimum PC: GeForce GT 640; 2 GB RAM · 2 GB disk; Full requirements

What is Ammossum?

You search plague-stricken railroads for your missing family in this single-player, side-scrolling action roguelike. Across runs, you shoot infected enemies, nest projectiles inside one another, and choose railcars with economic or battlefield-control bonuses. Repeated attempts unlock more weapons and mechanics.

For you if...

+you enjoy learning complex systems through trial and error
+you like managing resources alongside action combat

Not for you if...

−you want straightforward weapons with easily understood effects
−you prefer forgiving difficulty and gradual power increases

What players say

59% of 104 reviews are positive

Players praise the chain reactions possible through stacked projectile effects. They criticize uneven weapon and progression balance, unclear item interactions, and unreliable controller aiming.

Screenshots and trailer

Ammossum system requirements

Minimum: GeForce GT 640, 2 GB RAM, 2 GB of disk space.

As published by the developer.

Can my PC run Ammossum?

Tell us your graphics card once and every game page will answer this for you.

Set up my PC →

Minimum

OS: Windows 7 x64
Processor: Intel Core i3-4160 / AMD FX-4300
Graphics: GeForce GT 640 / Radeon HD 7750 / Intel UHD Graphics 620
Memory: 2 GB RAM
Storage: 2 GB available space
DirectX: Version 11

Does Ammossum have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Ammossum run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Some in-game text is small and may be hard to read
All functionality is accessible with the default controller configuration
Shows Steam Deck controller icons
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows
Achievements: 91
Steam features: Cloud saves, Family Sharing
Languages: Text only: English, Russian, Simplified Chinese, French, Japanese, Norwegian, Portuguese - Brazil, Spanish - Latin America.

Does Ammossum use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam