Games like Main Assembly
Games like Main Assembly include Garry's Mod, Bloons TD 6, Raft, Scrap Mechanic, and R.E.P.O.. We matched them by the tags players give Main Assembly on Steam (3D, Online Co-Op, Singleplayer, Sandbox, and Building): closest matches first, and among equally close ones the better-known games.
Garry's Mod
Shared: Sandbox · Building · Singleplayer
Bloons TD 6
Shared: Online Co-Op · Singleplayer · Co-op
Raft
Shared: Co-op · Online Co-Op · Building
Scrap Mechanic
Shared: Sandbox · Building · Co-op
R.E.P.O.
Shared: Online Co-Op · Co-op · 3D
Space Engineers
Shared: Sandbox · Building · Simulation
Farming Simulator 22
Shared: Co-op · Simulation · 3D
Waterpark Simulator
Shared: Co-op · Simulation · Singleplayer
Planet Coaster 2
Shared: Sandbox · 3D · Simulation
PEAK
Shared: Online Co-Op · Co-op · 3D
Kerbal Space Program
Shared: Sandbox · Simulation · Building
Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Singleplayer · 3D
PC Building Simulator
Shared: Simulation · 3D · Building
Fast Food Simulator
Shared: Online Co-Op · Simulation · Co-op
Terraria
Shared: Sandbox · Co-op · Building
Teardown
Shared: Sandbox · Singleplayer · Physics
PowerWash Simulator
Shared: 3D · Simulation · Co-op
Valheim
Shared: Online Co-Op · Building · Co-op
Supermarket Simulator
Shared: Simulation · Singleplayer · Building
Medieval Dynasty
Shared: Building · Co-op · Sandbox
Don't Starve Together
Shared: Co-op · Online Co-Op · Sandbox
Ranch Simulator: Build, Hunt, Farm
Shared: Online Co-Op · Simulation · Co-op
House Flipper
Shared: Singleplayer · Simulation · Building