Games like Extinction Eclipse
Games like Extinction Eclipse include Oxygen Not Included, Cosmoteer: Starship Architect & Commander, Reassembly, FTL: Faster Than Light, and Dyson Sphere Program. We matched them by the tags players give Extinction Eclipse on Steam (Action RTS, Space, Indie, Singleplayer, and 2D): closest matches first, and among equally close ones the better-known games.
Oxygen Not Included
Shared: Singleplayer · Building · 2D
Cosmoteer: Starship Architect & Commander
Shared: Space · Singleplayer · Indie
Reassembly
Shared: Space · Building · 2D
FTL: Faster Than Light
Shared: Space · Indie · Singleplayer
Dyson Sphere Program
Shared: Space · Building · Resource Management
Heat Signature
Shared: Space · Indie · Top-Down
Iron Marines
Shared: Singleplayer · RTS · 2D
Space Pirates and Zombies
Shared: Space · Indie · Action
Space Engineers
Shared: Space · Building · Singleplayer
Planetary Annihilation: TITANS
Shared: RTS · Singleplayer · Strategy
Istrolid
Shared: Space · Indie · Building
Kingdom Rush 5: Alliance TD
Shared: Singleplayer · 2D · Cartoony
Kerbal Space Program
Shared: Space · Indie · Building
Executive Assault 2
Shared: Space · Building · RTS
STAR WARS™ Empire at War - Gold Pack
Shared: Space · Singleplayer · RTS
Mindustry
Shared: RTS · Building · Resource Management
Age of Empires IV: Anniversary Edition
Shared: RTS · Singleplayer · Action RTS
Company of Heroes 3
Shared: Singleplayer · Action RTS · RTS
Door Kickers
Shared: Indie · Singleplayer · Top-Down
Endless Sky
Shared: Space · Singleplayer · 2D
Creeper World 3: Arc Eternal
Shared: Indie · Singleplayer · RTS
Aliens: Dark Descent
Shared: Singleplayer · RTS · Action
Prison Architect
Shared: Building · 2D · Base Building
Age of Empires II: Definitive Edition
Shared: RTS · Singleplayer · Strategy