Games like Orbital Decay
Games like Orbital Decay include Kerbal Space Program, Superflight, Goat Simulator, Retrowave, and House Flipper. We matched them by the tags players give Orbital Decay on Steam (Action, Casual, Simulation, Education, and Exploration): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Education · Space

Superflight
Shared: Casual · Action · Indie

Goat Simulator
Shared: Simulation · Casual · Action

Retrowave
Shared: Casual · Action · Simulation

House Flipper
Shared: Simulation · Casual · Singleplayer

SPORE™
Shared: Simulation · Casual · Exploration

Passpartout: The Starving Artist
Shared: Casual · Simulation · Hand-drawn

Gang Beasts
Shared: Action · Casual · Simulation

Universe Sandbox
Shared: Simulation · Education · Casual

Garry's Mod
Shared: Casual · Simulation · Physics

鬼谷八荒 Tale of Immortal
Shared: Simulation · Action · Singleplayer

Ship Graveyard Simulator
Shared: Simulation · Action · Exploration

Trailmakers
Shared: Action · Singleplayer · Space

Slime Rancher
Shared: Exploration · Simulation · Casual

Session: Skate Sim
Shared: Simulation · Action · Exploration

Barn Finders
Shared: Casual · Simulation · Exploration

SPORE™ Galactic Adventures
Shared: Action · Simulation · Exploration

DAVE THE DIVER
Shared: Casual · Exploration · Simulation

Prison Escape Simulator: Dig Out
Shared: Simulation · Casual · Action

Mountain
Shared: Simulation · Casual · Indie

KovaaK's
Shared: Action · Simulation · Indie

Project Wingman
Shared: Action · Flight · Simulation

Uncrashed : FPV Drone Simulator
Shared: Simulation · Flight · Singleplayer

Sparkle 2 Evo
Shared: Casual · Action · Simulation