Games like Colony
Games like Colony include Plague Inc: Evolved, Wargame: Red Dragon, Call to Arms, Creeper World 3: Arc Eternal, and Game Dev Tycoon. We matched them by the tags players give Colony on Steam (Simulation, Strategy, Indie, RTS, and Real-Time): closest matches first, and among equally close ones the better-known games.

Plague Inc: Evolved
Shared: Simulation · Strategy · Indie

Wargame: Red Dragon
Shared: Strategy · RTS · Simulation

Call to Arms
Shared: Strategy · RTS · Simulation

Creeper World 3: Arc Eternal
Shared: Strategy · Indie · RTS

Game Dev Tycoon
Shared: Simulation · Indie · Strategy

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

Anno 2070™
Shared: Strategy · Simulation · RTS

Age of Mythology: Extended Edition
Shared: Strategy · RTS · Simulation

Rise of Nations: Extended Edition
Shared: Strategy · RTS · Simulation

8-Bit Armies
Shared: Simulation · Strategy · Indie

Men of War: Assault Squad 2
Shared: Strategy · Simulation · RTS

Sea Power : Naval Combat in the Missile Age
Shared: Simulation · Strategy · Real-Time

Circle Empires
Shared: Strategy · Indie · RTS

Banished
Shared: Strategy · Simulation · Indie

Mini Motorways
Shared: Simulation · Strategy · Indie

Rusted Warfare - RTS
Shared: Strategy · RTS · Indie

911 Operator
Shared: Simulation · Strategy · Indie

Crusader Kings III
Shared: Strategy · Simulation · RTS

Ultimate Epic Battle Simulator 2
Shared: Simulation · Strategy · RTS

Steel Division 2
Shared: Strategy · RTS · Simulation

Ultimate General: Gettysburg
Shared: Strategy · Simulation · RTS

Door Kickers
Shared: Strategy · Simulation · Indie

Wargame: Airland Battle
Shared: Strategy · RTS · Simulation

Company of Heroes 2
Shared: Strategy · RTS · Real-Time