Games like Terraformer Expedition to Mars
Games like Terraformer Expedition to Mars include Space Engineers, Empyrion - Galactic Survival, Kerbal Space Program, Oxygen Not Included, and Spacebase DF-9. We matched them by the tags players give Terraformer Expedition to Mars on Steam (Simulation, Indie, Space, Survival, and Mars): closest matches first, and among equally close ones the better-known games.

Space Engineers
Shared: Space · Simulation · Survival

Empyrion - Galactic Survival
Shared: Simulation · Space · Survival

Kerbal Space Program
Shared: Simulation · Space · Indie

Oxygen Not Included
Shared: Survival · Simulation · Space

Spacebase DF-9
Shared: Simulation · Space · Indie

Take On Mars
Shared: Simulation · Space · Mars

FTL: Faster Than Light
Shared: Space · Indie · Simulation

Tin Can
Shared: Simulation · Space · Indie

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

Feed and Grow: Fish
Shared: Simulation · Survival · Indie

Banished
Shared: Simulation · Indie · Survival

Breathedge
Shared: Space · Survival · Indie

Project Zomboid
Shared: Survival · Indie · Simulation

Mountain
Shared: Simulation · Indie · Space

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

One Hour One Life
Shared: Simulation · Indie · Survival

IXION
Shared: Space · Survival · Simulation

The Long Journey Home
Shared: Simulation · Indie · Space

Starbound
Shared: Space · Survival · Indie

Planetbase
Shared: Space · Simulation · Survival

Don't Starve
Shared: Survival · Indie · Simulation

This War of Mine
Shared: Survival · Simulation · Indie

Papers, Please
Shared: Simulation · Indie

Space Haven
Shared: Survival · Space · Simulation