Single-player games like Orbital Decay
Below are 8 single-player Steam games similar to Orbital Decay, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Orbital Decay page.
Ranked picks
- 1
Kerbal Space Program
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Indie and Simulation with Orbital Decay.
In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble fully-functional spacecraft that flies (or doesn’t) based on realistic aerodynamic and orbital physics.
- 2
SPORE™
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Action and Simulation with Orbital Decay.
Be the architect of your own universe with Spore, an exciting single-player adventure. From Single Cell to Galactic God, evolve your creature in a universe of your own creations.
- 3
Universe Sandbox
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Indie and Simulation with Orbital Decay.
Create & destroy on an unimaginable scale with a realistic physics-based space simulator. Explore the beauty of our universe and the fragility of our planet. Use science to bend the laws of gravity, collide planets, boil away oceans, fire epic space lasers, and customize your universe.
- 4
Space Simulation Toolkit
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Indie and Simulation with Orbital Decay.
Physics sandbox game that uses a graphics card as a supercomputer. Change the laws of physics, design mechanisms, create A-Life worlds and inhabit them with living beings, experiment with evolution and AI.
- 5
EVERSPACE™ 2
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Action and Simulation with Orbital Decay.
EVERSPACE 2 is a fast-paced single-player spaceship shooter with exploration in space and on planets, tons of loot, RPG elements, mining, and crafting. Experience an exciting sci-fi story set in a vivid, handcrafted open world full of secrets, puzzles, and perils.
- 6
Rocket Science
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Simulation with Orbital Decay.
Take part in a space program. Design spacecrafts and send them off to explore the vast expanses of space. Experience the real scale of the Solar system and the size of its celestial bodies.
- 7
Evochron Mercenary
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Action and Indie with Orbital Decay.
The life of an independent mercenary is rarely without excitement. Your spacecraft awaits and your adventure begins in the Sapphire star system.
- 8
SpaceEngine
Single-player alternative to Orbital Decay — playable solo, no multiplayer required. Shares Indie and Simulation with Orbital Decay.
The world's first science-based photorealistic interactive 3D planetarium that models the entire Universe, using procedural generation for uncharted areas.