Games like Unclaimed World
Games like Unclaimed World include RimWorld, Oxygen Not Included, Banished, Space Haven, and Stellaris. We matched them by the tags players give Unclaimed World on Steam (Simulation, Strategy, Indie, Survival, and Sci-fi): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Strategy · Survival · Colony Sim

Oxygen Not Included
Shared: Survival · Colony Sim · Simulation

Banished
Shared: Strategy · Simulation · Colony Sim

Space Haven
Shared: Strategy · Survival · Colony Sim

Stellaris
Shared: Strategy · Space · Sci-fi

Planetbase
Shared: Strategy · Colony Sim · Simulation

Dawn of Man
Shared: Strategy · Simulation · Survival

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

Spacebase DF-9
Shared: Simulation · Strategy · Sci-fi

The Universim
Shared: Colony Sim · Survival · Strategy

Dwarf Fortress
Shared: Simulation · Strategy · Colony Sim

Space Engineers
Shared: Simulation · Survival · Sandbox

Amazing Cultivation Simulator
Shared: Simulation · Strategy · Sandbox

Kerbal Space Program
Shared: Simulation · Space · Sandbox

SPORE™
Shared: Simulation · Colony Sim · Sandbox

Maia
Shared: Strategy · Simulation · Colony Sim

Endzone - A World Apart
Shared: Strategy · Survival · Simulation

Stonehearth
Shared: Colony Sim · Strategy · Simulation

Aven Colony
Shared: Strategy · Simulation · Colony Sim

Craft The World
Shared: Colony Sim · Survival · Strategy

Empyrion - Galactic Survival
Shared: Simulation · Survival · Space

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Castle Story
Shared: Strategy · Colony Sim · Survival

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