Games like Mars Colony:Challenger
Games like Mars Colony:Challenger include No Man's Sky, Don't Starve Together, Home Behind, Empyrion - Galactic Survival, and Between the Stars. We matched them by the tags players give Mars Colony:Challenger on Steam (Simulation, Adventure, Indie, RPG, and Space): closest matches first, and among equally close ones the better-known games.

No Man's Sky
Shared: Space · Adventure · Survival

Don't Starve Together
Shared: Adventure · Survival · Indie

Home Behind
Shared: Adventure · RPG · Indie

Empyrion - Galactic Survival
Shared: Simulation · Space · Survival

Between the Stars
Shared: Simulation · RPG · Space

Rebel Galaxy
Shared: Space · RPG · Adventure

The Long Journey Home
Shared: Simulation · Indie · RPG

Space Pirates And Zombies 2
Shared: Space · Indie · RPG

Deliver Us The Moon
Shared: Adventure · Indie · Space

Hand Simulator: Survival
Shared: Adventure · Simulation · Survival

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

Home Behind 2
Shared: Adventure · RPG · Simulation

Endless Sky
Shared: Space · Simulation · Adventure

Kerbal Space Program
Shared: Simulation · Space · Indie

Elite Dangerous
Shared: Space · Simulation · Sci-fi

Breathedge
Shared: Space · Indie · Survival

SKYHILL
Shared: Adventure · Indie · Survival

FTL: Faster Than Light
Shared: Space · Indie · Sci-fi

Starbound
Shared: Adventure · Space · Survival

Mr. Prepper
Shared: Simulation · Survival · Adventure

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Adventure

Starfield
Shared: Space · RPG · Sci-fi

Spacebase DF-9
Shared: Simulation · Space · Indie

Space Engineers
Shared: Simulation · Space · Survival