Single-player games like Under Domain - Alien Invasion Simulator
Below are 9 single-player Steam games similar to Under Domain - Alien Invasion Simulator, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Under Domain - Alien Invasion Simulator page.
Ranked picks
- 1
HOMUNCULCHU
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Simulation with Under Domain - Alien Invasion Simulator.
Guide fragile homunculi with limited lifespans through humanity's final bid for survival across six hostile worlds.
- 2
Empires of the Void II
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy with Under Domain - Alien Invasion Simulator.
A sci-fi turn-based strategy game. A faithful digital rendition of the beloved board game, Empires of the Void II.
- 3
Galactic Economy
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy and Indie with Under Domain - Alien Invasion Simulator.
Your road to financial freedom leads to the stars. Acquire strategic sectors, manage complex loans, and mitigate systemic risks to grow your passive income. A gritty sci-fi tycoon strategy game where every decision determines your path to galactic domination.
- 4
Gaia Project
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy and Indie with Under Domain - Alien Invasion Simulator.
Gaia Project is the digital adaptation of the boardgame Gaia Project created by Helge Ostertag and Jens Drögemüller and published by "Feuerland Verlag". It is a 1-4 player strategy game. It plays in the same universe as Terra Mystica and continues the adventure in the far future.
- 5
Attack of the Earthlings
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy and Indie with Under Domain - Alien Invasion Simulator.
Take on Galactoil, a comically dysfunctional intergalactic energy corporation, and its larger-than-life employees in a tactical-stealth game that fuses satisfying strategic gameplay and dark comedy in a quirky single-player story.
- 6
Sid Meier's Civilization®: Beyond Earth™
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy with Under Domain - Alien Invasion Simulator.
Sid Meier’s Civilization: Beyond Earth is a new science-fiction-themed entry into the award winning Civilization series. As part of an expedition sent to find a home beyond Earth, lead your people into a new frontier, explore and colonize an alien planet and create a new civilization in space.
- 7
ENDLESS™ Space - Definitive Edition
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy with Under Domain - Alien Invasion Simulator.
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS™ Universe, where you can control every aspect of your civilization as you strive for galactic domination.
- 8
Xenonauts
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy and Indie with Under Domain - Alien Invasion Simulator.
Xenonauts is a strategy game in which you control a multi-national military organisation defending a Cold War-era Earth from alien invasion, using small squads of persistent soldiers to eliminate the extraterrestrials and recover their technology in turn-based ground combat.
- 9
X-COM: UFO Defense
Single-player alternative to Under Domain - Alien Invasion Simulator — playable solo, no multiplayer required. Shares Strategy with Under Domain - Alien Invasion Simulator.
You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.