Games like Rebel Galaxy
Games like Rebel Galaxy include Starfield, Elite Dangerous, No Man's Sky, Fallout 4, and The Witcher 3: Wild Hunt — Remastered. We matched them by the tags players give Rebel Galaxy on Steam (Space, Open World, Sci-fi, RPG, and Adventure): closest matches first, and among equally close ones the better-known games.

Starfield
Shared: Space · Open World · RPG

Elite Dangerous
Shared: Space · Open World · Sci-fi

No Man's Sky
Shared: Space · Open World · Sci-fi

Fallout 4
Shared: Open World · RPG · Singleplayer

The Witcher 3: Wild Hunt — Remastered
Shared: Open World · RPG · Adventure

STAR WARS Jedi: Survivor™
Shared: Open World · Singleplayer · Sci-fi

Endless Sky
Shared: Space · Open World · Sci-fi

EVE Online
Shared: Open World · Space · Space Sim

Outer Wilds
Shared: Space · Great Soundtrack · Adventure

Cyberpunk 2077
Shared: Open World · RPG · Sci-fi

X Rebirth
Shared: Space · Sci-fi · Open World

Fallout: New Vegas
Shared: Open World · RPG · Singleplayer

X4: Foundations
Shared: Space · Open World · Sci-fi

SPORE™ Galactic Adventures
Shared: Space · Open World · Adventure

Kerbal Space Program
Shared: Space · Simulation · Space Sim

Mount & Blade II: Bannerlord
Shared: Open World · RPG · Singleplayer

Mass Effect (2007)
Shared: Sci-fi · RPG · Space

Starpoint Gemini 2
Shared: Space · Open World · RPG

Hogwarts Legacy
Shared: Open World · RPG · Adventure

Grand Theft Auto V Legacy
Shared: Open World · Action · Adventure

Space Rangers HD: A War Apart
Shared: Space · RPG · Open World

Between the Stars
Shared: Space · RPG · Action

Star Wars Outlaws
Shared: Open World · Singleplayer · Adventure

Monster Hunter: World
Shared: Open World · RPG · Action