Games like Diorama Worlds
Games like Diorama Worlds include Cities: Skylines, Prison Architect, Garry's Mod, Two Point Museum, and Townscaper. We matched them by the tags players give Diorama Worlds on Steam (Simulation, Indie, Casual, Sandbox, and City Builder): closest matches first, and among equally close ones the better-known games.

Cities: Skylines
Shared: Simulation · City Builder · Sandbox

Prison Architect
Shared: Simulation · Sandbox · Building

Garry's Mod
Shared: Sandbox · Casual · Building

Two Point Museum
Shared: Simulation · Casual · Sandbox

Townscaper
Shared: Sandbox · Casual · Simulation

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

Tiny Town VR
Shared: Simulation · Indie · Sandbox

Two Point Hospital
Shared: Simulation · Indie · Sandbox

Space Engineers
Shared: Sandbox · Simulation · Building

TheoTown
Shared: Simulation · City Builder · Sandbox

Rolling Line
Shared: Simulation · Sandbox · Casual

Foundation
Shared: Simulation · City Builder · Sandbox

Manor Lords
Shared: Simulation · City Builder · Sandbox

Kingdoms and Castles
Shared: Simulation · City Builder · Sandbox

Dwarf Fortress
Shared: Simulation · Sandbox · City Builder

House Flipper
Shared: Simulation · Sandbox · Casual

Banished
Shared: Simulation · City Builder · Indie

Two Point Campus
Shared: Simulation · Casual · City Builder

Against the Storm
Shared: Simulation · City Builder · Building

Timberborn
Shared: City Builder · Sandbox · Building

Dyson Sphere Program
Shared: Simulation · Building · Base Building

Endzone - A World Apart
Shared: Simulation · City Builder · Indie

Paralives
Shared: Simulation · Indie · Building

Kerbal Space Program
Shared: Simulation · Sandbox · Indie