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Alien Horizon (Preview Alpha)
A sci-fi survival city builder set on an inhospitable alien planet. Faced with imminent destruction of Earth, humanity pooled together their resources and sent sleeper ships to nearby potentially habitable planets. But this one turned out to be much less habitable than expected....
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26.
“Very complete for an Alpha Version. Lost track of time and welp it's 5am.”
— a player, Steam review · 7 hrs played“This game has amazing potential. It's fun so far but it needs more polish and simplification I think. You're given too much at the start and the level of coplexity is overwhelming”
— a player, Steam review · 11 hrs played“One of the most complex city builders that provides continual challenges even in an alpha version. Do not over explore or crash is likely to happen (causes high memory use i this version).”
— a player, Steam review · 609 hrs playedLatest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
Rewrite Devlog #19
Hello! Welcome to the, uh... August instance of the devlog, which has been slightly delayed. Sorry about that. More information on why is at the end. Nothing catastrophic this time. Anyway, the devlog
Playtest invitation
As promised in the last devlog, the playtest is up. Please join the Discord or Stoat where organization is taking place. You will find more information there.
Rewrite Devlog #18 and Playtest Date
Hello and welcome to the July's edition of the rewrite devlog. Yes, it still is July, at least here. As was said in all other devlogs, these are supposed to show some of the new features of the upcomi
Rewrite Devlog #17 and Playtest Announcement
Summer heat is here and with it the June's devlog, showing off some of the new features in the so called "rewrite" - a new proper version of Alien Horizon that's getting close to release, planned by t
Rewrite Devlog #16
You're reading the May's devlog now, showing new features you can expect in the proper version of Alien Horizon that's being rewritten from scratch and is planned for the end of summer (no promises).
Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-09-26.
| Genres | Simulation, Strategy, Free To Play |
| Player tags | City Builder · Strategy · Colony Sim · Simulation · Building · Survival · Free to Play · Base Building · 3D · Stylized · Sci-fi · Futuristic (Steam store community voting) |
| Features | Single-player · Family Sharing |
| Languages | English |
| Official site | http://www.purplenebulagames.com/alienhorizon.html |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS: Windows 10 Processor: 3 GHz, 4 cores Memory: 16 GB RAM Graphics: GTX 1060 or AMD equivalent DirectX: Version 11 Storage: 1 GB available space