Games like Planet's Edge
Games like Planet's Edge include Elite Dangerous, Starfield, No Man's Sky, EVE Online, and SPORE™. We matched them by the tags players give Planet's Edge on Steam (CRPG, Sci-fi, Open World, Space Sim, and RPG): closest matches first, and among equally close ones the better-known games.

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

Starfield
Shared: Open World · Sci-fi · RPG

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

EVE Online
Shared: Space Sim · Open World · Exploration

SPORE™
Shared: Open World · Simulation · Space

Rebel Galaxy
Shared: Sci-fi · Open World · RPG

X4: Foundations
Shared: Open World · Space Sim · Simulation

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

Fallout 4
Shared: Open World · RPG · Exploration

Kerbal Space Program
Shared: Simulation · Space · Space Sim

Starpoint Gemini Warlords
Shared: Open World · RPG · Sci-fi

PULSAR: Lost Colony
Shared: Open World · Space Sim · Simulation

Fallout: New Vegas
Shared: Open World · RPG · Sci-fi

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

Starcom: Unknown Space
Shared: Open World · Space Sim · Sci-fi

Empyrion - Galactic Survival
Shared: Simulation · Open World · Space

Starpoint Gemini 2
Shared: Open World · Sci-fi · RPG

Dyson Sphere Program
Shared: Open World · Sci-fi · Space

X Rebirth
Shared: Sci-fi · Simulation · Space Sim

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

Starcom: Nexus
Shared: Sci-fi · RPG · Space

Fallout: A Post Nuclear Role Playing Game
Shared: RPG · Open World · Sci-fi

SpaceCraft
Shared: Sci-fi · Open World · Space

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