Games like The Undercity: Last Light
Games like The Undercity: Last Light include Frostpunk, RimWorld, Oxygen Not Included, Kingdoms and Castles, and Frostpunk 2. We matched them by the tags players give The Undercity: Last Light on Steam (Colony Sim, Strategy, City Builder, Management, and Survival): closest matches first, and among equally close ones the better-known games.

Frostpunk
Shared: City Builder · Strategy · Survival

RimWorld
Shared: Colony Sim · Strategy · Survival

Oxygen Not Included
Shared: Colony Sim · Survival · Management

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

Frostpunk 2
Shared: Strategy · City Builder · Survival

Manor Lords
Shared: Strategy · City Builder · Simulation

Banished
Shared: Colony Sim · City Builder · Strategy

IXION
Shared: Strategy · City Builder · Colony Sim

Against the Storm
Shared: Strategy · City Builder · Simulation

Dwarf Fortress
Shared: Colony Sim · Strategy · City Builder

Prison Architect
Shared: Colony Sim · Strategy · Simulation

Endzone - A World Apart
Shared: City Builder · Strategy · Survival

Infection Free Zone
Shared: City Builder · Strategy · Management

Space Haven
Shared: Colony Sim · Strategy · Survival

Settlement Survival
Shared: Colony Sim · City Builder · Management

Ostriv
Shared: Strategy · City Builder · Colony Sim

The Wandering Village
Shared: City Builder · Colony Sim · Management

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

They Are Billions
Shared: Colony Sim · Strategy · Survival

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

This War of Mine
Shared: Survival · Strategy · Simulation

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

Norland
Shared: Strategy · City Builder · Colony Sim

Going Medieval
Shared: Colony Sim · Strategy · Survival