Games like simpliCity
Games like simpliCity include Cities: Skylines, Prison Architect, Cities: Skylines II, Garry's Mod, and Manor Lords. We matched them by the tags players give simpliCity on Steam (Sandbox, City Builder, Building, Base Building, and Isometric): closest matches first, and among equally close ones the better-known games.

Cities: Skylines
Shared: City Builder · Building · Sandbox

Prison Architect
Shared: Sandbox · Building · Base Building

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

Garry's Mod
Shared: Sandbox · Building · Casual

Manor Lords
Shared: City Builder · Base Building · Simulation

Townscaper
Shared: Sandbox · Building · City Builder

Space Engineers
Shared: Sandbox · Building · Simulation

SimCity™ 4 Deluxe Edition
Shared: City Builder · Sandbox · Building

Two Point Museum
Shared: Building · City Builder · Sandbox

Two Point Hospital
Shared: Building · Simulation · Sandbox

Dyson Sphere Program
Shared: Building · Base Building · Sandbox

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

Two Point Campus
Shared: Building · City Builder · Sandbox

Oxygen Not Included
Shared: Base Building · Building · Sandbox

Foundation
Shared: City Builder · Sandbox · Simulation

House Flipper
Shared: Building · Simulation · Sandbox

Planet Zoo
Shared: Sandbox · Building · City Builder

Jurassic World Evolution
Shared: Building · Sandbox · Simulation

Jurassic World Evolution 2
Shared: Building · Sandbox · City Builder

Kingdoms and Castles
Shared: City Builder · Sandbox · Building

Dwarf Fortress
Shared: Base Building · City Builder · Sandbox

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

Timberborn
Shared: City Builder · Sandbox · Building

Songs of Syx
Shared: City Builder · Sandbox · Base Building

