Games like Unending Galaxy
Games like Unending Galaxy include Stellaris, X4: Foundations, Kerbal Space Program, FTL: Faster Than Light, and Game Dev Tycoon. We matched them by the tags players give Unending Galaxy on Steam (Strategy, Simulation, Indie, Space, and Sandbox): closest matches first, and among equally close ones the better-known games.
Stellaris
Shared: Strategy · Space · Simulation
X4: Foundations
Shared: Simulation · Space · Strategy
Kerbal Space Program
Shared: Simulation · Space · Sandbox
FTL: Faster Than Light
Shared: Strategy · Space · Indie
Game Dev Tycoon
Shared: Simulation · Strategy · Indie
Cosmoteer: Starship Architect & Commander
Shared: Space · Strategy · Indie
Starpoint Gemini Warlords
Shared: Strategy · Space · Simulation
RimWorld
Shared: Strategy · Sandbox · Simulation
Dyson Sphere Program
Shared: Space · Simulation · Strategy
Hardspace: Shipbreaker
Shared: Simulation · Space · Sci-fi
X Rebirth
Shared: Simulation · Space · Sandbox
Space Engineers
Shared: Sandbox · Space · Simulation
Elite Dangerous
Shared: Space · Simulation · Space Sim
Oxygen Not Included
Shared: Simulation · Strategy · 2D
Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox
X3: Terran Conflict
Shared: Simulation · Space · Strategy
Spaceflight Simulator
Shared: Simulation · Sandbox · Space
Endless Sky
Shared: Space · Simulation · 2D
Distant Worlds: Universe
Shared: Strategy · Space · Simulation
Reassembly
Shared: Strategy · Space · Sandbox
Spacebase DF-9
Shared: Simulation · Space · Strategy
Mount & Blade II: Bannerlord
Shared: Strategy · Sandbox · Simulation
Plague Inc: Evolved
Shared: Strategy · Simulation · Indie
Banished
Shared: Strategy · Simulation · Indie