Games like Ducktopia
Games like Ducktopia include Cities: Skylines, Cities: Skylines II, Dyson Sphere Program, Manor Lords, and Prison Architect. We matched them by the tags players give Ducktopia on Steam (City Builder, Simulation, Base Building, Management, and Building): closest matches first, and among equally close ones the better-known games.

Cities: Skylines
Shared: City Builder · Simulation · Management

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

Dyson Sphere Program
Shared: Base Building · Building · Simulation

Manor Lords
Shared: City Builder · Simulation · Base Building

Prison Architect
Shared: Simulation · Base Building · Building

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

Frostpunk
Shared: City Builder · Resource Management · Base Building

Kingdoms and Castles
Shared: City Builder · Simulation · Management

Oxygen Not Included
Shared: Base Building · Building · Management

Captain of Industry
Shared: Base Building · Simulation · Resource Management

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

Planet Zoo
Shared: Simulation · Management · City Builder

Ostriv
Shared: City Builder · Simulation · Management

Jurassic World Evolution 2
Shared: Simulation · Management · Building

Jurassic World Evolution
Shared: Simulation · Building · Management

Empires of the Undergrowth
Shared: Simulation · City Builder · Base Building

Foundation
Shared: City Builder · Simulation · Management

Norland
Shared: Simulation · City Builder · Base Building

Gas Station Simulator
Shared: Simulation · Management · Building

Tavern Master
Shared: Simulation · Management · Building

Settlement Survival
Shared: City Builder · Building · Simulation

Supermarket Simulator
Shared: Simulation · Management · Building

SimAirport
Shared: City Builder · Management · Base Building

Transport Fever 2
Shared: Simulation · Management · City Builder