Free games like Project Substrata
Below are 9 free-to-play Steam games similar to Project Substrata, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Project Substrata page.
Ranked picks
- 1
Ultimate Custom Night
Free-to-play alternative to Project Substrata — no purchase or trial window.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 2
The Lab
Free-to-play alternative to Project Substrata — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 3
Control, I'm Not Coming Back
Free-to-play alternative to Project Substrata — no purchase or trial window.
Control, I'm Not Coming Back is a short and emotional narrative game about a lost astronaut searching for a reason to keep going forward while facing the emptiness of space. Inspired by the Hopecore aesthetic, it’s a story about positivism, friendship and our human connection with Voyager 1.
- 4
No Results Found
Free-to-play alternative to Project Substrata — no purchase or trial window. Shares Simulation with Project Substrata.
Search, dig deeper, and search again. Can you reach the end of the truth?
- 5
SuchArt: Creative Space
Free-to-play alternative to Project Substrata — no purchase or trial window. Shares Simulation with Project Substrata.
Paint on any surfaces with numerous tools in Creative Space — a free sandbox version of SuchArt: Genius Artist Simulator. Create masterpieces, complete commissions, and decorate your studio in the most advanced artist sim!
- 6
Aircar
Free-to-play alternative to Project Substrata — no purchase or trial window.
A simple immersive flying game built for VR. Pilot an aircar through a futuristic cityscape.
- 7
Crime Scene Cleaner: Prologue
Free-to-play alternative to Project Substrata — no purchase or trial window. Shares Simulation with Project Substrata.
When there’s a call, you are the man to clean up after your client’s dirty job. Siding with the mafia is a dangerous game, but they pay well, and you need money, right? So take your mop and better remove those bloodstains quickly before the police come.
- 8
Outpath: First Journey
Free-to-play alternative to Project Substrata — no purchase or trial window.
Outpath: First Journey is a prologue chapter of the main game, Outpath. An experimental clicker base building game. Craft, gather & manage resources, build your base and buy more islands to exploit and expand!
- 9
Space
Free-to-play alternative to Project Substrata — no purchase or trial window. Shares Simulation with Project Substrata.
Stranded on a hostile alien world, you must gather resources, craft tools, and automate production to survive. Build a base, fend off deadly wildlife, and uncover ancient secrets in this immersive sci-fi survival adventure. Will you conquer the planet or succumb to its perils?