Games like Poly Towns
Games like Poly Towns include Kingdoms and Castles, ISLANDERS, Foundation, Townscaper, and Frostpunk. We matched them by the tags players give Poly Towns on Steam (Casual, Relaxing, Building, City Builder, and Colony Sim): closest matches first, and among equally close ones the better-known games.

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

ISLANDERS
Shared: Relaxing · City Builder · Building

Foundation
Shared: City Builder · Simulation · Building

Townscaper
Shared: Relaxing · Building · Casual

Frostpunk
Shared: City Builder · Colony Sim · Building

Prison Architect
Shared: Building · Simulation · Colony Sim

Banished
Shared: City Builder · Colony Sim · Simulation

Mini Motorways
Shared: Casual · Relaxing · Simulation

Oxygen Not Included
Shared: Colony Sim · Building · Base Building

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

Manor Lords
Shared: City Builder · Base Building · Building

Cities: Skylines
Shared: City Builder · Building · Simulation

Against the Storm
Shared: City Builder · Building · Base Building

Tavern Master
Shared: Building · Relaxing · Simulation

Ostriv
Shared: City Builder · Colony Sim · Building

Dwarf Fortress
Shared: Colony Sim · Base Building · City Builder

Planet Coaster
Shared: Building · Relaxing · Simulation

SUMMERHOUSE
Shared: Relaxing · Casual · City Builder

Dorfromantik
Shared: Relaxing · Casual · City Builder

Minami Lane
Shared: Casual · Relaxing · Simulation

Ballads of Hongye: REBORN
Shared: Casual · City Builder · Relaxing

Farthest Frontier
Shared: Building · City Builder · Colony Sim

Town to City
Shared: Building · City Builder · Relaxing

Settlement Survival
Shared: Building · City Builder · Colony Sim