BastionOS

Incremental tower defense with aimed artillery and a growing arsenal

Feral Paw · Released Apr 28, 2026

Reviews: Very Positive; 97% of 177
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 5 months ago; May 6, 2026
Minimum PC: DirectX 11 GPU; 4 GB RAM · 0.2 GB disk; Full requirements

What is BastionOS?

BastionOS is an isometric, single-player game where you defend humanity's last line against a machine army. You select levels, fire at approaching enemies, and collect the resources they drop. When your tower falls, you strengthen it with weapons and upgrades, researching new technology for later attempts.

For you if...

+you like action games that let you set the pace

Not for you if...

−you want a lengthy campaign rather than a short game

What players say

97% of 177 reviews are positive

Players praise the upgrade progression, visual design, and music. Some say upgrade choices can slow progress or create temporary walls. A colorblind reviewer reports difficulty distinguishing enemies in crowded fights.

Screenshots and trailer

BastionOS system requirements

Minimum: DirectX 11 GPU, 4 GB RAM, 0.2 GB of disk space.

As published by the developer.

Can my PC run BastionOS?

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

Set up my PC →

Minimum

OS: Windows 10 (64-bit)
Processor: 2.0 GHz
Graphics: GPU with basic DirectX 11 support
Memory: 4 GB RAM
Storage: 200 MB available space
DirectX: Version 11

Does BastionOS have co-op or multiplayer?

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

Single-player

Does BastionOS run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows, macOS
Achievements: 52
Steam features: Cloud saves, Family Sharing
Languages: Text only: English, Japanese, Portuguese - Brazil, Simplified Chinese, Turkish.

Does BastionOS 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