Games like MasonsHaven
Games like MasonsHaven include Garry's Mod, Totally Accurate Battle Simulator, Space Engineers, Wobbledogs, and PowerWash Simulator. We matched them by the tags players give MasonsHaven on Steam (Simulation, Casual, Sandbox, 3D, and Colorful): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Casual · Building

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Colorful

Space Engineers
Shared: Sandbox · Simulation · Building

Wobbledogs
Shared: Simulation · Sandbox · Wholesome

PowerWash Simulator
Shared: Casual · Simulation · 3D

House Flipper
Shared: Simulation · Sandbox · Casual

Poly Bridge
Shared: Simulation · Building · Sandbox

People Playground
Shared: Sandbox · Simulation · Physics

Kerbal Space Program
Shared: Simulation · Sandbox · Building

Goat Simulator
Shared: Simulation · Sandbox · Casual

PC Building Simulator
Shared: Simulation · Sandbox · Building

Besiege
Shared: Simulation · Sandbox · Building

Prison Architect
Shared: Simulation · Sandbox · Building

Planet Coaster
Shared: Simulation · Sandbox · Building

Cities: Skylines
Shared: Simulation · Sandbox · Building

Fun with Ragdolls: The Game
Shared: Sandbox · Simulation · 3D

Townscaper
Shared: Sandbox · Casual · Building

Planet Coaster 2
Shared: Simulation · Sandbox · 3D

Hozy
Shared: Casual · Sandbox · Simulation

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Building · 3D

SUMMERHOUSE
Shared: Sandbox · Casual · Building

Poly Bridge 3
Shared: Simulation · 3D · Building

My Dream Setup
Shared: Simulation · Sandbox · Casual

Scrap Mechanic
Shared: Sandbox · Building · Base Building