Games like Galactineers
Games like Galactineers include Totally Accurate Battle Simulator, Kerbal Space Program, Don't Starve Together, Don't Starve, and The Scroll of Taiwu : Beyond The Dome. We matched them by the tags players give Galactineers on Steam (Strategy, Indie, Adventure, Simulation, and Sandbox): closest matches first, and among equally close ones the better-known games.

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Kerbal Space Program
Shared: Simulation · Sandbox · Space

Don't Starve Together
Shared: Adventure · Crafting · Sandbox

Don't Starve
Shared: Adventure · Indie · Crafting

The Scroll of Taiwu : Beyond The Dome
Shared: Strategy · Sandbox · Indie

Starbound
Shared: Sandbox · Adventure · Space

The Escapists
Shared: Strategy · Crafting · Indie

Mount & Blade II: Bannerlord
Shared: Strategy · Sandbox · Simulation

Graveyard Keeper
Shared: Simulation · Crafting · Indie

Stellaris
Shared: Strategy · Space · Sandbox

Terraria
Shared: Sandbox · Adventure · Crafting

SPORE™ Galactic Adventures
Shared: Simulation · Adventure · Space

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

Game Dev Tycoon
Shared: Indie · Strategy · Simulation

Craft The World
Shared: Sandbox · Crafting · Strategy

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

Towns
Shared: Indie · Strategy · Simulation

Banished
Shared: Strategy · Simulation · Indie

Between the Stars
Shared: Indie · Strategy · Simulation

Plague Inc: Evolved
Shared: Strategy · Indie · Simulation

Automation - The Car Company Tycoon Game
Shared: Simulation · Sandbox · Strategy

Spacebase DF-9
Shared: Simulation · Strategy · Indie

Empyrion - Galactic Survival
Shared: Simulation · Space · Sandbox

Space Engineers
Shared: Sandbox · Simulation · Space