Games like Per Aspera - Blue Mars
Games like Per Aspera - Blue Mars include RimWorld, Totally Accurate Battle Simulator, Prison Architect, Manor Lords, and Dwarf Fortress. We matched them by the tags players give Per Aspera - Blue Mars on Steam (Strategy, Indie, Simulation, Base Building, and Sandbox): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Strategy · Base Building · Sandbox

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Sandbox

Prison Architect
Shared: Simulation · Strategy · Base Building

Manor Lords
Shared: Strategy · Simulation · Base Building

Dwarf Fortress
Shared: Strategy · Simulation · Base Building

Amazing Cultivation Simulator
Shared: Simulation · Strategy · Sandbox

Oxygen Not Included
Shared: Base Building · Strategy · Simulation

Against the Storm
Shared: Strategy · Simulation · Base Building

Game Dev Tycoon
Shared: Indie · Simulation · Strategy

Foundation
Shared: Simulation · Strategy · Sandbox

Plague Inc: Evolved
Shared: Strategy · Simulation · Indie

Banished
Shared: Strategy · Simulation · Indie

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

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

Kingdoms and Castles
Shared: Strategy · Simulation · Sandbox

Factorio
Shared: Base Building · Strategy · Sandbox

Spacebase DF-9
Shared: Simulation · Strategy · Base Building

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

Total Tank Simulator
Shared: Strategy · Simulation · Indie

Infection Free Zone
Shared: Base Building · Strategy · Simulation

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

Kenshi
Shared: Sandbox · Simulation · Strategy

Space Engineers
Shared: Sandbox · Simulation · Base Building

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