Under Domain - Alien Invasion Simulator

Turn-based strategy about secretly preparing Earth for an alien invasion

Playlearn · Released Oct 22, 2020

Reviews: Mixed; 47% of 79
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 5 years ago; Jul 1, 2021
Minimum PC: IGP; 4 GB RAM · 4 GB disk; Full requirements

What is Under Domain - Alien Invasion Simulator?

You lead reptilian aliens in a single-player strategy game set between 1900 and 2020. Each turn spans a decade: you extract energy and minerals, send hybrid agents to sabotage human progress, and upgrade your mothership and fleet before attacking. Keeping your activities hidden matters because humans can discover your presence and strike first.

For you if...

+you enjoy board-game-style strategy built around resource management

Not for you if...

−you want fast-paced action rather than deliberate, turn-based planning

What players say

47% of 79 reviews are positive

Players praise the alien-invader premise, music, and visual presentation. Recurring complaints concern freezes, broken upgrades, and invasions that stall, alongside lengthy unskippable animations and limited replay value.

Screenshots and trailer

Under Domain - Alien Invasion Simulator screenshot 1

Under Domain - Alien Invasion Simulator system requirements

Minimum: IGP, 4 GB RAM, 4 GB of disk space.

As published by the developer.

Can my PC run Under Domain - Alien Invasion Simulator?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS: Windows 7 (SP1+)
Processor: Core i3
Graphics: IGP
Memory: 4 GB RAM
Storage: 4 GB available space
DirectX: Version 11

Does Under Domain - Alien Invasion Simulator have co-op or multiplayer?

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

Single-player

Does Under Domain - Alien Invasion Simulator 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: Keyboard and mouse
Platforms: Windows
Steam features: Family Sharing
Languages: Full audio: English, Portuguese - Brazil.

Does Under Domain - Alien Invasion Simulator 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