Games like Galactic Empire
Games like Galactic Empire include Stellaris, X4: Foundations, ENDLESS Space™ - Definitive Edition, Kerbal Space Program, and Galactic Civilizations IV. We matched them by the tags players give Galactic Empire on Steam (4X, Space, Strategy, Sci-fi, and Exploration): closest matches first, and among equally close ones the better-known games.
Stellaris
Shared: Space · Strategy · 4X
X4: Foundations
Shared: Space · 4X · Simulation
ENDLESS Space™ - Definitive Edition
Shared: 4X · Strategy · Space
Kerbal Space Program
Shared: Space · Sandbox · Simulation
Galactic Civilizations IV
Shared: Space · 4X · Strategy
Sid Meier's Civilization®: Beyond Earth™
Shared: Strategy · Space · 4X
ENDLESS Space™ 2
Shared: Space · Strategy · 4X
Cosmoteer: Starship Architect & Commander
Shared: Sci-fi · Space · Strategy
Elite Dangerous
Shared: Space · Sci-fi · Exploration
No Man's Sky
Shared: Space · Sci-fi · Exploration
FTL: Faster Than Light
Shared: Space · Strategy · Sci-fi
Oxygen Not Included
Shared: Strategy · Sandbox · Space
Sid Meier’s Civilization® VI
Shared: Strategy · 4X · Turn-Based Strategy
Sins of a Solar Empire®: Rebellion
Shared: Space · Strategy · 4X
Dyson Sphere Program
Shared: Space · Sci-fi · Simulation
RimWorld
Shared: Strategy · Sandbox · Sci-fi
Anno 2205™
Shared: Strategy · 4X · Sci-fi
SPORE™
Shared: Sandbox · Space · Exploration
Hardspace: Shipbreaker
Shared: Space · Sci-fi · Simulation
Game Dev Tycoon
Shared: Strategy · Simulation · Management
X Rebirth
Shared: Space · Sci-fi · Simulation
Cities: Skylines
Shared: Strategy · Simulation · Sandbox
Distant Worlds: Universe
Shared: 4X · Strategy · Space
Spaceflight Simulator
Shared: Space · Sandbox · Exploration