Best Space Sim Games on Steam
Steam currently has 1,383 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 12/29/2025.
Looking for more? Explore other lists such as:
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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 88,541 reviews on Steam. This breaks down to a total of 86,391 positive reviews and 2,150 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 | 1/21/2021 |
| 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 136,471 reviews on Steam. This breaks down to a total of 132,102 positive reviews and 4,369 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 29,608 reviews on Steam. This breaks down to a total of 28,549 positive reviews and 1,059 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 131,314 reviews on Steam. This breaks down to a total of 125,046 positive reviews and 6,268 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 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 | $9.99 |
| 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 76,867 reviews on Steam. This breaks down to a total of 73,174 positive reviews and 3,693 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $2.49 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 | $2.49 |
| 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 14,074 reviews on Steam. This breaks down to a total of 13,514 positive reviews and 560 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 7,004 reviews on Steam. This breaks down to a total of 6,745 positive reviews and 259 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. 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 #8 spot for the best Space Sim games. Its score was calculated by analyzing a total of 1,106 reviews on Steam. This breaks down to a total of 1,087 positive reviews and 19 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 |
9. 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 #9 spot for the best Space Sim games. Its score was calculated by analyzing a total of 12,190 reviews on Steam. This breaks down to a total of 11,534 positive reviews and 656 negative reviews — making it "Very Positive" on Steam.
It is priced at $13.99 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 | $13.99 |
| Release Date | 10/24/2022 |
| Developer | Walternate Realities |
| Publisher | Walternate Realities |
| Steam App Id | 799600 |
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 1,126 reviews on Steam. This breaks down to a total of 1,093 positive reviews and 33 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $34.99 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 | $34.99 |
| Release Date | 11/7/2025 |
| 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 | ||||
|---|---|---|---|---|---|---|
| 4,395 | 1/21/2021 | 96 | $15.99 | Steam Charts | |
| 12,858 | 7/30/2019 | 95 | $7.49 | Steam Charts | |
| 505 | 8/24/2015 | 94 | $20.09 | Steam Charts | |
| 2,051 | 4/27/2015 | 94 | $9.99 | Steam Charts | |
| 1,141 | 9/14/2012 | 94 | $2.49 | Steam Charts | |
| 249 | 6/11/2019 | 93 | $17.99 | Steam Charts | |
| 149 | 2/18/2022 | 93 | $14.99 | Steam Charts | |
| 34 | 10/18/2021 | 92 | $4.89 | Steam Charts | |
| 523 | 10/24/2022 | 92 | $13.99 | Steam Charts | |
| 53 | 11/7/2025 | 91 | $34.99 | Steam Charts | |
 | 193 | 9/25/2025 | 91 | $11.99 | Steam Charts | |
 | 327 | 6/12/2012 | 91 | $5.99 | Steam Charts | |
 | 517 | 3/13/2024 | 91 | $16.09 | Steam Charts | |
 | 110 | 7/14/2025 | 90 | $3.99 | Steam Charts | |
 | 113 | 10/30/2015 | 89 | Free | Steam Charts | |
 | 48 | 7/21/2023 | 89 | $5.59 | Steam Charts | |
 | 1 | 10/9/2024 | 89 | Free | Steam Charts | |
 | 8 | 7/15/2022 | 89 | $9.99 | Steam Charts | |
 | 475 | 9/2/2024 | 89 | $24.99 | Steam Charts | |
 | 1 | 5/3/2024 | 89 | $2.09 | 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, December 29). Steam Store. Steam Store.
- Valve Corporation. (2025, December 29). Dyson Sphere Program on Steam. Steam Store.
- Valve Corporation. (2026, January 1). Oxygen Not Included on Steam. Steam Store.
- Valve Corporation. (2026, January 1). Universe Sandbox on Steam. Steam Store.
- Valve Corporation. (2025, December 19). Kerbal Space Program on Steam. Steam Store.
- Valve Corporation. (2025, December 24). FTL: Faster Than Light on Steam. Steam Store.
- Valve Corporation. (2025, December 31). SpaceEngine on Steam. Steam Store.
- Valve Corporation. (2026, January 1). Spaceflight Simulator on Steam. Steam Store.
- Valve Corporation. (2025, December 19). Fractal Block World on Steam. Steam Store.
- Valve Corporation. (2025, December 21). Cosmoteer: Starship Architect & Commander on Steam. Steam Store.
- Valve Corporation. (2025, December 8). Reentry - A Space Flight Simulator on Steam. Steam Store.