Games like SpaceEngine
Games like SpaceEngine include Universe Sandbox, Kerbal Space Program, No Man's Sky, X4: Foundations, and SPORE™. We matched them by the tags players give SpaceEngine on Steam (Open World, Sci-fi, Casual, Sandbox, and Space): closest matches first, and among equally close ones the better-known games.
Universe Sandbox
Shared: Sandbox · Space · Space Sim
Kerbal Space Program
Shared: Space · Sandbox · Space Sim
No Man's Sky
Shared: Open World · Sci-fi · Space
X4: Foundations
Shared: Open World · Space · Sandbox
SPORE™
Shared: Open World · Sandbox · Casual
Elite Dangerous
Shared: Open World · Sci-fi · Space
Kerbal Space Program 2
Shared: Sandbox · Space · Open World
Avorion
Shared: Sandbox · Open World · Space Sim
Dyson Sphere Program
Shared: Space · Open World · Sci-fi
Universe Sandbox
Shared: Sandbox · Space · Casual
Spaceflight Simulator
Shared: Sandbox · Space · Space Sim
Space Engineers
Shared: Sandbox · Space · Open World
Hardspace: Shipbreaker
Shared: Sci-fi · Space · Sandbox
Solar Expanse - Space Exploration Manager
Shared: Space · Sandbox · Sci-fi
Starfield
Shared: Open World · Space · Sci-fi
X Rebirth
Shared: Sci-fi · Space · Open World
Astrox Imperium
Shared: Space · Open World · Sandbox
Rebel Galaxy
Shared: Open World · Sci-fi · Space
Starbase
Shared: Open World · Sandbox · Space Sim
Space Engineers 2
Shared: Sandbox · Sci-fi · Space
Starpoint Gemini 2
Shared: Open World · Space · Sci-fi
Empyrion - Galactic Survival
Shared: Space · Open World · Sandbox
X3: Terran Conflict
Shared: Sci-fi · Space · Sandbox
SpaceCraft
Shared: Sci-fi · Open World · Space