Games like Decay
Games like Decay include Kerbal Space Program, Melvor Idle, Garry's Mod, Particul, and Fortune Mill. We matched them by the tags players give Decay on Steam (Idler, Simulation, Science, Automation, and Physics): closest matches first, and among equally close ones the better-known games.
Kerbal Space Program
Shared: Simulation · Science · Physics
Melvor Idle
Shared: Idler · Casual · Singleplayer
Garry's Mod
Shared: Physics · Casual · Simulation
Particul
Shared: Simulation · Idler · Casual
Fortune Mill
Shared: Idler · Automation · Simulation
Universe Sandbox
Shared: Simulation · Physics · Science
Universe Sandbox
Shared: Simulation · Science · Physics
Nodebuster
Shared: Idler · Simulation · Casual
Digseum
Shared: Idler · Simulation · Casual
Goat Simulator
Shared: Simulation · Physics · Casual
BeamNG.drive
Shared: Simulation · Physics · Singleplayer
Mini Motorways
Shared: Simulation · Casual · Minimalist
Beltmatic
Shared: Automation · Simulation · Casual
Maltese's Fluffy Onsen
Shared: Simulation · Automation · Idler
Rusty's Retirement
Shared: Idler · Automation · Simulation
How To Grow a Black Hole
Shared: Simulation · Idler · Casual
The Farmer Was Replaced
Shared: Idler · Automation · Simulation
People Playground
Shared: Physics · Simulation · Singleplayer
Click and Conquer
Shared: Simulation · Idler · Casual
Mountain
Shared: Simulation · Casual · Singleplayer
Gamblers Table
Shared: Automation · Minimalist · Idler
Cooking Simulator
Shared: Simulation · Singleplayer · Physics