Games like The Mims Beginning
Games like The Mims Beginning include Kingdoms and Castles, Banished, The Universim, Cities: Skylines, and Manor Lords. We matched them by the tags players give The Mims Beginning on Steam (God Game, Colony Sim, City Builder, Action RTS, and RTS): closest matches first, and among equally close ones the better-known games.

Kingdoms and Castles
Shared: Colony Sim · City Builder · Simulation

Banished
Shared: Colony Sim · City Builder · Simulation

The Universim
Shared: Colony Sim · God Game · City Builder

Cities: Skylines
Shared: City Builder · Simulation · Sandbox

Manor Lords
Shared: City Builder · Simulation · Strategy

RimWorld
Shared: Colony Sim · Sandbox · Strategy

Prison Architect
Shared: Colony Sim · Simulation · Sandbox

SPORE™
Shared: God Game · Colony Sim · Sandbox

Foundation
Shared: City Builder · Simulation · Sandbox

Dawn of Man
Shared: Colony Sim · City Builder · Simulation

Oxygen Not Included
Shared: Colony Sim · Resource Management · Sandbox

Dwarf Fortress
Shared: Colony Sim · City Builder · Simulation

Frostpunk
Shared: City Builder · Colony Sim · Strategy

Against the Storm
Shared: City Builder · Simulation · Strategy

Anno 1800
Shared: City Builder · Simulation · Strategy

Cities: Skylines II
Shared: City Builder · Simulation · Sandbox

Gnomoria
Shared: Colony Sim · City Builder · Sandbox

WorldBox - God Simulator
Shared: God Game · Colony Sim · Sandbox

Timberborn
Shared: Colony Sim · City Builder · Sandbox

Workers & Resources: Soviet Republic
Shared: City Builder · Simulation · Strategy

Anno 2070™
Shared: City Builder · Simulation · Strategy

Jurassic World Evolution
Shared: Simulation · City Builder · Sandbox

Empires of the Undergrowth
Shared: City Builder · Colony Sim · Simulation

Planetbase
Shared: Colony Sim · City Builder · Simulation