Free Aliens Games on Steam
Steam currently has 2,444 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 11/21/2024.
Looking for more? Explore other lists such as:
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1. 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 holds the #1 spot for "best free Aliens game on Steam" with a Player Score of 88. Its score was calculated by analyzing a total of 1,925 reviews on Steam. This breaks down to a total of 1,783 positive reviews and 142 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 |
2. 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 has achieved a Player Score of 70, placing it in the #2 spot for the best free Aliens games. Its score was calculated by analyzing a total of 173,933 reviews on Steam. This breaks down to a total of 121,965 positive reviews and 51,968 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 |
3. 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 #3 spot for the best free Aliens games. Its score was calculated by analyzing a total of 1,182 reviews on Steam. This breaks down to a total of 1,084 positive reviews and 98 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 |
4. 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 #4 spot for the best free Aliens games. Its score was calculated by analyzing a total of 25,750 reviews on Steam. This breaks down to a total of 25,315 positive reviews and 435 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).
5. 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 #5 spot for the best free Aliens games. Its score was calculated by analyzing a total of 22,010 reviews on Steam. This breaks down to a total of 20,902 positive reviews and 1,108 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 Alien Swarm: Reactive Drop on the Steam Deck.
| Release Date | 4/20/2017 |
| Developer | Reactive Drop Team |
| Publisher | Reactive Drop Team |
| Steam App Id | 563560 |
6. Dungeon Crusher: Soul Hunters
A social multiplayer incremental idle rpg with clans, PvP arenas, a wonderful 3d fantasy world with a story/missions and much more.
Dungeon Crusher: Soul Hunters has achieved a Player Score of 68, placing it in the #6 spot for the best free Aliens games. Its score was calculated by analyzing a total of 102 reviews on Steam. This breaks down to a total of 76 positive reviews and 26 negative reviews — making it "Mostly 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.
| Release Date | 10/30/2024 |
| Developer | Towards Mars Limited |
| Publisher | Towards Mars Limited |
| Steam App Id | 842980 |
7. 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 #7 spot for the best free Aliens games. Its score was calculated by analyzing a total of 7,652 reviews on Steam. This breaks down to a total of 6,986 positive reviews and 666 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 |
8. Half-Life 2: Update
A completely free and extensive community-developed update for Half-Life 2 featuring beautiful lighting, countless bug fixes, and a brand new Community Commentary Mode. With Half-Life 2: Update, there’s never been a better time to revisit City 17.
Half-Life 2: Update has achieved a Player Score of 91, placing it in the #8 spot for the best free Aliens games. Its score was calculated by analyzing a total of 7,871 reviews on Steam. This breaks down to a total of 7,370 positive reviews and 501 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Half-Life 2: Update on the Steam Deck (though some functionality may be limited).
| Release Date | 3/27/2015 |
| Developers | |
| Publisher | Filip Victor |
| Steam App Id | 290930 |
9. 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 59, placing it in the #9 spot for the best free Aliens games. Its score was calculated by analyzing a total of 737 reviews on Steam. This breaks down to a total of 445 positive reviews and 292 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 |
10. Finn Dorset's Institute For Livestock Replication
An animated incremental game about cloning livestock. Make as many moon sheep as you can. Research technology, upgrade your operation and become a clone farm billionaire!
Finn Dorset's Institute For Livestock Replication has achieved a Player Score of 80, placing it in the #10 spot for the best free Aliens games. Its score was calculated by analyzing a total of 152 reviews on Steam. This breaks down to a total of 135 positive reviews and 17 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 10/3/2024 |
| Developer | CarlMorganArt |
| Publisher | CarlMorganArt |
| Steam App Id | 3135530 |
More Free Aliens Games
Explore even more rankings for the 100 best free Aliens games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 4,046 | 7/27/2023 | 88 | Free | Steam Charts | |
| 1,553 | 11/15/2021 | 70 | Free | Steam Charts | |
| 731 | 5/2/2022 | 87 | Free | Steam Charts | |
| 588 | 8/20/2022 | 96 | Free | Steam Charts | |
| 310 | 4/20/2017 | 93 | Free | Steam Charts | |
| 309 | 10/30/2024 | 68 | Free | Steam Charts | |
| 275 | 8/31/2022 | 88 | Free | Steam Charts | |
| 263 | 3/27/2015 | 91 | Free | Steam Charts | |
| 219 | 12/14/2016 | 59 | Free | Steam Charts | |
| 213 | 10/3/2024 | 80 | Free | Steam Charts | |
 | 134 | 9/16/2022 | 94 | Free | Steam Charts | |
 | 97 | 2/27/2013 | 72 | Free | Steam Charts | |
 | 96 | 12/15/2022 | 88 | Free | Steam Charts | |
 | 83 | 4/17/2024 | 51 | Free | Steam Charts | |
 | 55 | 12/5/2014 | 90 | Free | Steam Charts | |
 | 31 | 4/16/2024 | 81 | Free | Steam Charts | |
 | 30 | 11/11/2024 | 69 | Free | Steam Charts | |
 | 24 | 3/28/2024 | 56 | Free | Steam Charts | |
 | 19 | 4/6/2023 | 90 | Free | Steam Charts | |
 | 15 | 5/20/2021 | 78 | 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, November 21). Steam Store. Steam Store.
- Valve Corporation. (2024, November 21). Unnamed Space Idle on Steam. Steam Store.
- Valve Corporation. (2024, November 23). Halo Infinite on Steam. Steam Store.
- Valve Corporation. (2024, October 8). Trimps on Steam. Steam Store.
- Valve Corporation. (2024, November 20). Entropy : Zero 2 on Steam. Steam Store.
- Valve Corporation. (2024, November 23). Alien Swarm: Reactive Drop on Steam. Steam Store.
- Valve Corporation. (2024, November 22). Dungeon Crusher: Soul Hunters on Steam. Steam Store.
- Valve Corporation. (2024, September 9). Galaxy Life on Steam. Steam Store.
- Valve Corporation. (2024, November 21). Half-Life 2: Update on Steam. Steam Store.
- Valve Corporation. (2024, November 19). Operation: New Earth on Steam. Steam Store.
- Valve Corporation. (2024, November 22). Finn Dorset's Institute For Livestock Replication on Steam. Steam Store.