Games like Stardust Origins
Games like Stardust Origins include Starfield, Elite Dangerous, Endless Sky, EVE Online, and No Man's Sky. We matched them by the tags players give Stardust Origins on Steam (Space, Adventure, Top-Down, Simulation, and Open World): closest matches first, and among equally close ones the better-known games.

Starfield
Shared: Space · Open World · RPG

Elite Dangerous
Shared: Space · Open World · Simulation

Endless Sky
Shared: Space · Open World · Simulation

EVE Online
Shared: Adventure · Space · Open World

No Man's Sky
Shared: Space · Open World · Adventure

Rebel Galaxy
Shared: Space · Open World · Adventure

Fallout 4
Shared: Open World · Adventure · RPG

STAR WARS Jedi: Survivor™
Shared: Adventure · Open World · Singleplayer

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

X4: Foundations
Shared: Space · Simulation · Open World

SPORE™ Galactic Adventures
Shared: Space · Simulation · Adventure

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

X Rebirth
Shared: Space · Simulation · Sci-fi

Cyberpunk 2077
Shared: Open World · RPG · Singleplayer

Starcom: Nexus
Shared: Space · Adventure · RPG

Space Rangers HD: A War Apart
Shared: Space · Adventure · RPG

Hogwarts Legacy
Shared: Adventure · Open World · RPG

Outer Wilds
Shared: Space · Adventure · Open World

Crimson Desert Enhanced
Shared: Open World · Adventure · Singleplayer

SPORE™
Shared: Open World · Space · Simulation

Starpoint Gemini 2
Shared: Space · Simulation · Open World

Kerbal Space Program
Shared: Space · Simulation · Space Sim

Between the Stars
Shared: Space · Simulation · RPG

God of War
Shared: Adventure · Singleplayer · Action