Games like Generation Exile
Games like Generation Exile include Oxygen Not Included, Frostpunk, RimWorld, Timberborn, and IXION. We matched them by the tags players give Generation Exile on Steam (City Builder, Colony Sim, Building, Management, and Nature): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Colony Sim · Building · Management

Frostpunk
Shared: City Builder · Colony Sim · Survival

RimWorld
Shared: Colony Sim · Management · Survival

Timberborn
Shared: City Builder · Colony Sim · Building

IXION
Shared: City Builder · Colony Sim · Space

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

Space Haven
Shared: Colony Sim · Management · Survival

Dwarf Fortress
Shared: Colony Sim · City Builder · Simulation

Manor Lords
Shared: City Builder · Simulation · Management

Prison Architect
Shared: Building · Colony Sim · Simulation

The Universim
Shared: City Builder · Colony Sim · Building

Against the Storm
Shared: City Builder · Building · Simulation

Planetbase
Shared: City Builder · Colony Sim · Space

Settlement Survival
Shared: City Builder · Colony Sim · Building

Banished
Shared: City Builder · Colony Sim · Simulation

Dyson Sphere Program
Shared: Building · Space · Base Building

Ostriv
Shared: City Builder · Colony Sim · Simulation

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

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

Endzone - A World Apart
Shared: City Builder · Colony Sim · Survival

Cities: Skylines
Shared: City Builder · Building · Management

Going Medieval
Shared: Colony Sim · City Builder · Management

Foundation
Shared: City Builder · Simulation · Management

Norland
Shared: City Builder · Colony Sim · Simulation