Colony Siege

Sci-fi tower defense with laser fences that shape enemy routes

Finifugal Games · Released Sep 7, 2020

Reviews: Very Positive; 90% of 203
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 6 years ago; Oct 8, 2020
Minimum PC: DirectX 11 GPU, 2 GB; 4 GB RAM · 15 GB disk; Full requirements

What is Colony Siege?

You defend space colonies against alien swarms and corrupted former humans in this real-time strategy and tower defense hybrid. Across a branching campaign, you place towers and traps, command tanks and mechs, and call in air or orbital strikes to protect each colony's Citadel. Mission rewards pay for permanent upgrades and new equipment.

For you if...

+you want to coordinate defenses with a friend online

Not for you if...

−you want tower defense without managing troops or abilities

What players say

90% of 203 reviews are positive

Players praise the variety of defensive tools and tactical choices. Recurring complaints concern uneven difficulty and upgrade balance.

Screenshots and trailer

Colony Siege system requirements

Minimum: DirectX 11 GPU, 2 GB, 4 GB RAM, 15 GB of disk space.

As published by the developer.

Can my PC run Colony Siege?

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Minimum

OS: Windows 7
Processor: Intel Core i5 or AMD equivalent
Graphics: DirectX 11 compliant graphics card with 2GB dedicated memory
Memory: 4 GB RAM
Storage: 15 GB available space
DirectX: Version 11

Does Colony Siege have co-op or multiplayer?

Yes: co-op online. It also has a single-player mode.

Does Colony Siege run on Steam Deck?

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

Default controller config not fully functional
Sometimes shows mouse, keyboard or non-Deck controller icons
Some in-game text is small and may be hard to read
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 24
Steam features: Cloud saves, Family Sharing
Languages: Full audio: English. Text only: French, Italian, German, Spanish - Spain, Japanese, Korean, Portuguese - Brazil, Russian, Simplified Chinese.

Does Colony Siege 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