Games like Tinytopia
Games like Tinytopia include Garry's Mod, Cities: Skylines, Cities: Skylines II, Poly Bridge, and Totally Accurate Battle Simulator. We matched them by the tags players give Tinytopia on Steam (City Builder, Physics, Casual, Building, and Crafting): closest matches first, and among equally close ones the better-known games.
Garry's Mod
Shared: Physics · Sandbox · Building
Cities: Skylines
Shared: City Builder · Building · Simulation
Cities: Skylines II
Shared: City Builder · Building · Sandbox
Poly Bridge
Shared: Physics · Building · Simulation
Totally Accurate Battle Simulator
Shared: Sandbox · Physics · Simulation
Two Point Hospital
Shared: Building · Simulation · Singleplayer
Planet Coaster
Shared: Building · Simulation · Sandbox
People Playground
Shared: Physics · Sandbox · Singleplayer
Planet Coaster 2
Shared: City Builder · Building · Sandbox
Two Point Museum
Shared: Casual · City Builder · Building
Townscaper
Shared: City Builder · Building · Casual
Two Point Campus
Shared: City Builder · Building · Casual
Poly Bridge 2
Shared: Physics · Building · Sandbox
Planet Zoo
Shared: Building · City Builder · Sandbox
Scrap Mechanic
Shared: Building · Physics · Sandbox
Kerbal Space Program
Shared: Physics · Sandbox · Simulation
House Flipper
Shared: Building · Simulation · Singleplayer
Jurassic World Evolution
Shared: Building · City Builder · Simulation
Goat Simulator
Shared: Physics · Simulation · Sandbox
Prison Architect
Shared: Building · Sandbox · City Builder
Let's School
Shared: City Builder · Building · Sandbox
Space Engineers
Shared: Building · Sandbox · Physics
Stonehearth
Shared: City Builder · Building · Sandbox
Banished
Shared: City Builder · Simulation · Singleplayer