Games like RimWorld - Royalty
Games like RimWorld - Royalty include RimWorld, Oxygen Not Included, Prison Architect, Dwarf Fortress, and Going Medieval. We matched them by the tags players give RimWorld - Royalty 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

Dwarf Fortress
Shared: Colony Sim · Base Building · Strategy

Going Medieval
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

Against the Storm
Shared: Strategy · Base Building · Simulation

Frostpunk
Shared: Survival · Colony Sim · Strategy

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

Planetbase
Shared: Colony Sim · Base Building · Strategy

Factorio
Shared: Base Building · Strategy · Survival

Kingdoms and Castles
Shared: Colony Sim · Simulation · Strategy

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

Norland
Shared: Strategy · Base Building · Colony Sim

Cities: Skylines
Shared: Simulation · Strategy · Management

Dawn of Man
Shared: Colony Sim · Survival · Strategy

Infection Free Zone
Shared: Base Building · Strategy · Survival

This War of Mine
Shared: Survival · Strategy · Base Building

Ostriv
Shared: Strategy · Colony Sim · Simulation

Amazing Cultivation Simulator
Shared: Simulation · Strategy · Colony Sim

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