Best Space Sim Games on Steam
Steam currently has 1,223 Space Sim games available to download and play. Explore our list of the best picks ranked by Player Score. Our Player Score rankings are calculated directly from reviews left on the Steam store and will be updated in real-time as more players leave their feedback. Space Sim game rankings were last updated on 6/30/2025.
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1. Dyson Sphere Program
Build the most efficient intergalactic factory in space simulation strategy game Dyson Sphere Program! Harness the power of stars, collect resources, plan and design production lines and develop your interstellar factory from a small space workshop to a galaxy-wide industrial empire.
Dyson Sphere Program holds the #1 spot for "best Space Sim game on Steam" with a Player Score of 96. Its score was calculated by analyzing a total of 85,474 reviews on Steam. This breaks down to a total of 83,467 positive reviews and 2,007 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $15.99 to play and can be played and ran on Windows systems. At the moment, it is possible to play Dyson Sphere Program on the Steam Deck (though some functionality may be limited).
| Steam Price | $15.99 |
| Release Date | 1/20/2021 |
| Developer | Youthcat Studio |
| Publishers | |
| Steam App Id | 1366540 |
2. Oxygen Not Included
Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.
Oxygen Not Included has achieved a Player Score of 95, placing it in the #2 spot for the best Space Sim games. Its score was calculated by analyzing a total of 130,373 reviews on Steam. This breaks down to a total of 126,144 positive reviews and 4,229 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $7.49 to play and can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $7.49 |
| Release Date | 7/30/2019 |
| Franchise | Klei |
| Developer | Klei Entertainment |
| Publisher | Klei Entertainment |
| Steam App Id | 457140 |
3. Universe Sandbox
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.
Universe Sandbox has achieved a Player Score of 94, placing it in the #3 spot for the best Space Sim games. Its score was calculated by analyzing a total of 27,719 reviews on Steam. This breaks down to a total of 26,718 positive reviews and 1,001 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $20.09 to play and can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Universe Sandbox on the Steam Deck (though some functionality may be limited).
| Steam Price | $20.09 |
| Release Date | 8/24/2015 |
| Developer | Giant Army |
| Publisher | Giant Army |
| Steam App Id | 230290 |
4. Kerbal Space Program
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.
Kerbal Space Program has achieved a Player Score of 94, placing it in the #4 spot for the best Space Sim games. Its score was calculated by analyzing a total of 127,968 reviews on Steam. This breaks down to a total of 121,798 positive reviews and 6,170 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $3.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Kerbal Space Program on the Steam Deck (though some functionality may be limited).
| Steam Price | $3.99 |
| Release Date | 4/27/2015 |
| Franchise | Private Division |
| Developer | Squad |
| Publisher | Private Division |
| Steam App Id | 220200 |
5. FTL: Faster Than Light
This "spaceship simulation roguelike-like" allows you to take your ship and crew on an adventure through a randomly generated galaxy filled with glory and bitter defeat.
FTL: Faster Than Light has achieved a Player Score of 94, placing it in the #5 spot for the best Space Sim games. Its score was calculated by analyzing a total of 75,395 reviews on Steam. This breaks down to a total of 71,867 positive reviews and 3,528 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $2.99 to play and can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play FTL: Faster Than Light on the Steam Deck (though some functionality may be limited).
| Steam Price | $2.99 |
| Release Date | 9/14/2012 |
| Developer | Subset Games |
| Publisher | Subset Games |
| Steam App Id | 212680 |
6. SpaceEngine
The world's first science-based photorealistic interactive 3D planetarium that models the entire Universe, using procedural generation for uncharted areas.
SpaceEngine has achieved a Player Score of 93, placing it in the #6 spot for the best Space Sim games. Its score was calculated by analyzing a total of 12,794 reviews on Steam. This breaks down to a total of 12,277 positive reviews and 517 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $17.99 to play and can be played and ran on Windows systems. At the moment, it is not possible to play or run SpaceEngine on the Steam Deck.
| Steam Price | $17.99 |
| Release Date | 6/11/2019 |
| Developer | Cosmographic Software |
| Publisher | Cosmographic Software |
| Steam App Id | 314650 |
7. Spaceflight Simulator
In Spaceflight Simulator, you will get to build your rockets, plan launches and flights, attempt landings, deploy payloads and explore new worlds.
Spaceflight Simulator has achieved a Player Score of 93, placing it in the #7 spot for the best Space Sim games. Its score was calculated by analyzing a total of 6,411 reviews on Steam. This breaks down to a total of 6,170 positive reviews and 241 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $14.99 to play and can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Spaceflight Simulator on the Steam Deck (though some functionality may be limited).
| Steam Price | $14.99 |
| Release Date | 2/18/2022 |
| Developers | |
| Publishers | |
| Steam App Id | 1718870 |
8. Cosmoteer: Starship Architect & Commander
Design and simulate the starships of your dreams! Command your ship or fleet in epic battles and manage your crew while exploring a dangerous galaxy. Play alone or with friends, test your ships in online PvP, and let your imagination reach for the stars!
Cosmoteer: Starship Architect & Commander has achieved a Player Score of 92, placing it in the #8 spot for the best Space Sim games. Its score was calculated by analyzing a total of 11,279 reviews on Steam. This breaks down to a total of 10,705 positive reviews and 574 negative reviews — making it "Very Positive" on Steam.
It is priced at $14.99 to play and can be played and ran on Windows systems. At the moment, it is possible to play Cosmoteer: Starship Architect & Commander on the Steam Deck (though some functionality may be limited).
| Steam Price | $14.99 |
| Release Date | 10/24/2022 |
| Developer | Walternate Realities |
| Publisher | Walternate Realities |
| Steam App Id | 799600 |
9. Fractal Block World
This is a surreal exploration game. Explore a massive fractal with great complexities. You can shrink infinitely to go deeper into the fractal. Or you can become larger by growing. Inner space awaits you in this infinite world.
Fractal Block World has achieved a Player Score of 92, placing it in the #9 spot for the best Space Sim games. Its score was calculated by analyzing a total of 666 reviews on Steam. This breaks down to a total of 657 positive reviews and 9 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $4.89 to play and can be played and ran on Windows systems. At the moment, it is possible to play Fractal Block World on the Steam Deck (though some functionality may be limited).
| Steam Price | $4.89 |
| Release Date | 10/18/2021 |
| Developer | Dan Hathaway |
| Publishers | |
| Steam App Id | 1540570 |
10. Reentry - A Space Flight Simulator
Do you have what it takes to be an astronaut? Reentry is a realistic space flight simulator based on NASAs space programs; from the first American human spaceflight in Project Mercury, the rendezvous and EVAs of Project Gemini to the Moon landing in Project Apollo.
Reentry - A Space Flight Simulator has achieved a Player Score of 91, placing it in the #10 spot for the best Space Sim games. Its score was calculated by analyzing a total of 842 reviews on Steam. This breaks down to a total of 819 positive reviews and 23 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $20.99 to play and can be played and ran on Windows systems. At the moment, it is not possible to play or run Reentry - A Space Flight Simulator on the Steam Deck.
| Steam Price | $20.99 |
| Release Date | 11/15/2018 |
| Developers | |
| Publishers | |
| Steam App Id | 882140 |
More Space Sim Games
Explore even more rankings for the 100 best Space Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 2,108 | 1/20/2021 | 96 | $15.99 | Steam Charts | |
| 8,687 | 7/30/2019 | 95 | $7.49 | Steam Charts | |
| 421 | 8/24/2015 | 94 | $20.09 | Steam Charts | |
| 3,775 | 4/27/2015 | 94 | $3.99 | Steam Charts | |
| 1,165 | 9/14/2012 | 94 | $2.99 | Steam Charts | |
| 182 | 6/11/2019 | 93 | $17.99 | Steam Charts | |
| 102 | 2/18/2022 | 93 | $14.99 | Steam Charts | |
| 397 | 10/24/2022 | 92 | $14.99 | Steam Charts | |
| 32 | 10/18/2021 | 92 | $4.89 | Steam Charts | |
| 19 | 11/15/2018 | 91 | $20.99 | Steam Charts | |
 | 30 | 6/22/2023 | 91 | $13.99 | Steam Charts | |
 | 317 | 3/13/2024 | 91 | $17.24 | Steam Charts | |
 | 242 | 6/12/2012 | 91 | $7.99 | Steam Charts | |
 | 28 | 7/21/2023 | 90 | $5.59 | Steam Charts | |
 | 113 | 10/30/2015 | 89 | Free | Steam Charts | |
 | 110 | 9/2/2024 | 89 | $17.49 | Steam Charts | |
 | 1 | 5/3/2024 | 89 | $2.09 | Steam Charts | |
 | 28 | 4/29/2025 | 89 | $13.49 | Steam Charts | |
 | 1 | 9/13/2017 | 89 | $4.94 | Steam Charts | |
 | 3 | 7/15/2022 | 89 | $6.49 | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Reviews and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2025, June 30). Steam Store. Steam Store.
- Valve Corporation. (2025, June 30). Dyson Sphere Program on Steam. Steam Store.
- Valve Corporation. (2025, July 10). Oxygen Not Included on Steam. Steam Store.
- Valve Corporation. (2025, July 9). Universe Sandbox on Steam. Steam Store.
- Valve Corporation. (2025, July 9). Kerbal Space Program on Steam. Steam Store.
- Valve Corporation. (2025, July 4). FTL: Faster Than Light on Steam. Steam Store.
- Valve Corporation. (2025, July 9). SpaceEngine on Steam. Steam Store.
- Valve Corporation. (2025, June 3). Spaceflight Simulator on Steam. Steam Store.
- Valve Corporation. (2025, July 9). Cosmoteer: Starship Architect & Commander on Steam. Steam Store.
- Valve Corporation. (2025, July 1). Fractal Block World on Steam. Steam Store.
- Valve Corporation. (2025, July 6). Reentry - A Space Flight Simulator on Steam. Steam Store.