Free Aliens Games on Steam
Steam currently has 2,070 Aliens games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Aliens game rankings were last updated on 5/18/2024.
Looking for more? Explore other lists such as:
- Best aliens games on Steam
- Best aliens Steam Deck games
- Best aliens Steam games for Mac OS
- Best aliens Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Halo Infinite
From one of gaming's most iconic sagas, Halo is bigger than ever. Featuring an expansive open-world campaign and a dynamic free to play multiplayer experience.
Halo Infinite holds the #1 spot for "best free Aliens game on Steam" with a Player Score of 70. Its score was calculated by analyzing a total of 170,705 reviews on Steam. This breaks down to a total of 120,568 positive reviews and 50,137 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Halo Infinite on the Steam Deck (though some functionality may be limited).
| Release Date | 11/15/2021 |
| Franchise | Xbox Game Studios |
| Developer | 343 Industries |
| Publisher | Xbox Game Studios |
| Steam App Id | 1240440 |
2. Unnamed Space Idle
Destroy endless waves of alien ships that have all but wiped out humanity in this long form, unfolding, sci-fi idle game. Customize your ship with different weapons and defenses to defeat specific enemy types and utilize a ton of different systems to increase your overall power.
Unnamed Space Idle has achieved a Player Score of 88, placing it in the #2 spot for the best free Aliens games. Its score was calculated by analyzing a total of 1,360 reviews on Steam. This breaks down to a total of 1,270 positive reviews and 90 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Unnamed Space Idle on the Steam Deck (though some functionality may be limited).
| Release Date | 7/27/2023 |
| Developer | Sylv |
| Publishers | |
| Steam App Id | 2471100 |
3. Machinika: Museum
Welcome to the Museum! Machinika Museum is a mystery game where you discover beautiful and mysterious machines of extra-terrestrial origins in an atmospheric galaxy-spanning 3D puzzle game. Will you be able to understand their stories and discover what happened to their previous owner?
Machinika: Museum has achieved a Player Score of 87, placing it in the #3 spot for the best free Aliens games. Its score was calculated by analyzing a total of 1,997 reviews on Steam. This breaks down to a total of 1,828 positive reviews and 169 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Steam Price | $7.99 |
| Release Date | 3/23/2021 |
| Developer | Littlefield Studio |
| Publishers | |
| Steam App Id | 1507190 |
4. Trimps
A text-based incremental idle game with a ridiculous amount of unique content. Automate old stuff as you unlock new stuff to keep things interesting for hours and hours, no spam clicking necessary! Trimps is everything you love about your favorite games, distilled to their purest form.
Trimps has achieved a Player Score of 87, placing it in the #4 spot for the best free Aliens games. Its score was calculated by analyzing a total of 1,065 reviews on Steam. This breaks down to a total of 979 positive reviews and 86 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Trimps on the Steam Deck.
| Release Date | 5/2/2022 |
| Developer | Greensatellite |
| Publisher | Greensatellite |
| Steam App Id | 1877960 |
5. Galaxy Life
The universe is full of Starlings, tiny orange aliens that want to take over the galaxy. Create your own space colony, fight epic battles and discover new planets. Train your soldiers, develop your technology and create unimaginable gadgets. Enjoy this huge social game with friends!
Galaxy Life has achieved a Player Score of 88, placing it in the #5 spot for the best free Aliens games. Its score was calculated by analyzing a total of 7,273 reviews on Steam. This breaks down to a total of 6,616 positive reviews and 657 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Galaxy Life on the Steam Deck (though some functionality may be limited).
| Release Date | 8/31/2022 |
| Developer | Phoenix Network |
| Publisher | Phoenix Network |
| Steam App Id | 1927780 |
6. Operation: New Earth
Operation: New Earth is an intense sci-fi multiplayer strategy game in which you must command an advanced military facility to defend Earth from a hostile alien invasion. Create an alliance, gather resources, and unlock advanced technology to level up your stronghold!
Operation: New Earth has achieved a Player Score of 58, placing it in the #6 spot for the best free Aliens games. Its score was calculated by analyzing a total of 693 reviews on Steam. This breaks down to a total of 412 positive reviews and 281 negative reviews — making it "Mixed" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 12/14/2016 |
| Developers | |
| Publishers | |
| Steam App Id | 528740 |
7. Alien Swarm: Reactive Drop
Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.
Alien Swarm: Reactive Drop has achieved a Player Score of 93, placing it in the #7 spot for the best free Aliens games. Its score was calculated by analyzing a total of 21,250 reviews on Steam. This breaks down to a total of 20,176 positive reviews and 1,074 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 4/20/2017 |
| Developer | Reactive Drop Team |
| Publisher | Reactive Drop Team |
| Steam App Id | 563560 |
8. Entropy : Zero 2
Bad Cop is back. Command a small army of Combine synths and soldiers on a Northern campaign to capture Dr. Judith Mossman. A modification for Half-Life 2.
Entropy : Zero 2 has achieved a Player Score of 96, placing it in the #8 spot for the best free Aliens games. Its score was calculated by analyzing a total of 23,108 reviews on Steam. This breaks down to a total of 22,724 positive reviews and 384 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Entropy : Zero 2 on the Steam Deck (though some functionality may be limited).
9. Chicken Invaders Universe
A deliciously addictive core of finger-blistering shooting action, surrounded by delectable morsels of galactic exploration, spacecraft customization, and community competitions.
Chicken Invaders Universe has achieved a Player Score of 88, placing it in the #9 spot for the best free Aliens games. Its score was calculated by analyzing a total of 3,201 reviews on Steam. This breaks down to a total of 2,933 positive reviews and 268 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Chicken Invaders Universe on the Steam Deck (though some functionality may be limited).
| Release Date | 12/15/2022 |
| Franchise | InterAction studios |
| Developer | InterAction studios |
| Publisher | InterAction studios |
| Steam App Id | 1510460 |
10. Half-Life 2: VR Mod
Half Life 2: VR Mod is a fan-made project, which adds full Virtual Reality support to the original 2004 PC gaming classic by Valve Software. Are you ready to become the Freeman?
Half-Life 2: VR Mod has achieved a Player Score of 94, placing it in the #10 spot for the best free Aliens games. Its score was calculated by analyzing a total of 5,737 reviews on Steam. This breaks down to a total of 5,619 positive reviews and 118 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Half-Life 2: VR Mod on the Steam Deck.
| Release Date | 9/16/2022 |
| Developer | Source VR Mod Team |
| Publishers | |
| Steam App Id | 658920 |
More Free Aliens Games
Explore even more rankings for the 100 best free Aliens games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
 | 4,222 | 11/15/2021 | 70 | Free | Steam Charts | |
 | 3,517 | 7/27/2023 | 88 | Free | Steam Charts | |
 | 838 | 3/23/2021 | 87 | $7.99 | Steam Charts | |
 | 660 | 5/2/2022 | 87 | Free | Steam Charts | |
 | 335 | 8/31/2022 | 88 | Free | Steam Charts | |
 | 236 | 12/14/2016 | 58 | Free | Steam Charts | |
 | 185 | 4/20/2017 | 93 | Free | Steam Charts | |
 | 109 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 104 | 12/15/2022 | 88 | Free | Steam Charts | |
 | 54 | 9/16/2022 | 94 | Free | Steam Charts | |
 | 52 | 3/28/2024 | 52 | Free | Steam Charts | |
 | 49 | 5/10/2024 | 86 | Free | Steam Charts | |
 | 34 | 3/27/2015 | 91 | Free | Steam Charts | |
 | 29 | 3/11/2024 | 83 | Free | Steam Charts | |
 | 20 | 4/17/2024 | 60 | Free | Steam Charts | |
 | 19 | 4/16/2024 | 82 | Free | Steam Charts | |
 | 18 | 2/12/2024 | 81 | Free | Steam Charts | |
 | 18 | 5/8/2024 | 78 | Free | Steam Charts | |
 | 15 | 12/5/2014 | 90 | Free | Steam Charts | |
 | 15 | 7/19/2010 | 93 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts 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. (2024, May 18). Steam Store. Steam Store.
- Valve Corporation. (2024, May 18). Halo Infinite on Steam. Steam Store.
- Valve Corporation. (2024, May 18). Unnamed Space Idle on Steam. Steam Store.
- Valve Corporation. (2024, May 17). Machinika: Museum on Steam. Steam Store.
- Valve Corporation. (2024, May 1). Trimps on Steam. Steam Store.
- Valve Corporation. (2024, March 1). Galaxy Life on Steam. Steam Store.
- Valve Corporation. (2024, May 14). Operation: New Earth on Steam. Steam Store.
- Valve Corporation. (2024, May 17). Alien Swarm: Reactive Drop on Steam. Steam Store.
- Valve Corporation. (2024, April 3). Entropy : Zero 2 on Steam. Steam Store.
- Valve Corporation. (2024, April 27). Chicken Invaders Universe on Steam. Steam Store.
- Valve Corporation. (2024, May 5). Half-Life 2: VR Mod on Steam. Steam Store.