Games like RimWorld - Odyssey
Games like RimWorld - Odyssey include RimWorld, Oxygen Not Included, Prison Architect, Going Medieval, and Dwarf Fortress. We matched them by the tags players give RimWorld - Odyssey on Steam (Colony Sim, Base Building, Survival, Strategy, and Simulation): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Colony Sim · Base Building · Survival

Oxygen Not Included
Shared: Colony Sim · Base Building · Survival

Prison Architect
Shared: Base Building · Colony Sim · Simulation

Going Medieval
Shared: Colony Sim · Base Building · Strategy

Dwarf Fortress
Shared: Colony Sim · Base Building · Strategy

Manor Lords
Shared: Strategy · Base Building · Simulation

Space Haven
Shared: Colony Sim · Base Building · Survival

Banished
Shared: Colony Sim · Strategy · Survival

Empires of the Undergrowth
Shared: Base Building · Strategy · Simulation

Frostpunk
Shared: Survival · Colony Sim · Strategy

Against the Storm
Shared: Strategy · Base Building · Simulation

Planetbase
Shared: Colony Sim · Base Building · Strategy

Factorio
Shared: Base Building · Strategy · Survival

Workers & Resources: Soviet Republic
Shared: Strategy · Base Building · Simulation

Endzone - A World Apart
Shared: Survival · Strategy · Base Building

This War of Mine
Shared: Survival · Strategy · Singleplayer

Norland
Shared: Strategy · Base Building · Colony Sim

Dawn of Man
Shared: Colony Sim · Survival · Strategy

Kingdoms and Castles
Shared: Colony Sim · Simulation · Strategy

Cities: Skylines
Shared: Simulation · Strategy · Management

Infection Free Zone
Shared: Base Building · Strategy · Survival

Amazing Cultivation Simulator
Shared: Simulation · Strategy · Colony Sim

They Are Billions
Shared: Colony Sim · Base Building · Strategy

Songs of Syx
Shared: Colony Sim · Strategy · Base Building