Screenshots
Watch trailer on Steam ↗COSMONAUT
Neon Chasm, LLC · Published by Neon Chasm, LLC · Official site ↗
Positive — 86% positive (44 reviews)
Last updated 27 Sept 2026
Unravel the mystery surrounding the lost vessel Diogenes. A story-driven retro platformer with elements of horror. Use the zero-g suit to explore the eerie corridors of a derelict ship filled with unknown lifeforms and dark secrets.
Free to PlayFull Controller Support
Free
Action, Adventure, Indie · 2018 · More free games
Embark on a story-driven journey through the derelict ship Diogenes as you unravel its mysterious past. Utilize the innovative zero-g suit to navigate the eerie corridors and uncover dark secrets in this action-adventure game from Neon Chasm, LLC.
About this game
COSMONAUT is an immersive story-driven horror platformer set two centuries in our future. Suit up as Jarobi, a green DSR (deep space reconnaissance) contractor tasked with boarding the S-class research vessel, Diogenes. Lost 80 years prior in the vast Kuiper Belt, the vessel has become an iconic symbol of humanity's early manned voyages to the outer solar system. The ship is for the taking, but at what cost?
Creatively explore a decrepit futuristic environment via unique movement mechanics, free from gravity using any surface you choose. Survive the dangers of deep space habitation through various puzzles and challenges. Arm yourself and choose to merely defend against, or fully exterminate foes of both extraterrestrial and artificial origin. Put your psychological resolve to the test and become the first to unravel the mysteries surrounding the lost Diogenes vessel.
Creatively explore a decrepit futuristic environment via unique movement mechanics, free from gravity using any surface you choose. Survive the dangers of deep space habitation through various puzzles and challenges. Arm yourself and choose to merely defend against, or fully exterminate foes of both extraterrestrial and artificial origin. Put your psychological resolve to the test and become the first to unravel the mysteries surrounding the lost Diogenes vessel.
System Requirements
Will my PC run this? →Minimum
Minimum:
- OS *: Microsoft Windows XP / Vista / 7 / 8
- Processor: 1.2GHz processor
- Memory: 512 MB RAM
- Graphics: DirectX 8-compatible graphics card with at least 32MB of video memory
- DirectX: Version 9.0c
- Storage: 250 MB available space
- Additional Notes: Microsoft Xbox 360 Controller or Direct Input compatible controller
Recommended
Recommended:
- OS *: Microsoft Windows XP / Vista / 7 / 8
- Processor: 1.4GHz processor
- Memory: 1 GB RAM
- Graphics: DirectX 8-compatible graphics card with at least 32MB of video memory
- DirectX: Version 9.0c
- Storage: 250 MB available space
- Additional Notes: Microsoft Xbox 360 Controller or Direct Input compatible controller
Supported Languages
English*
*languages with full audio support
*languages with full audio support
Latest news
AnnouncementsOfficial
COSMONAUT becomes Free-to-Play Jan. 1, 2020!
Greetings from Neon Chasm! COSMONAUT will become Free-to-Play by January 1st, 2020. We sincerely thank all those who supported us by purchasing the game over the past two years. It is our hope this change will allow the game to be enjoyed by as many players as possible. Happy Holidays, Brian / Neon ChasmRead full article on Community Announcements (Mauldini)Patch NotesOfficial
COSMONAUT Original Soundtrack Update!
The COSMONAUT Original Soundtrack is now included with each game purchase at no additional charge: http://cdn.edgecast.steamstatic.com/steamcommunity/public/images/clans/31482134/19db05d174e4138a5dae8a4646e478a26a8a321a.jpg 01. (1:26) Menu Theme 02. (1:39) Crossing the Rubicon 03. (2:15) Prologue Ship 04. (1:02) Tetherless 05. (2:14) The Chasm's Edge 06. (1:34) Glass House 07. (2:13) Sanctuary 08. (1:29) S I M O N 09. (3:01) A Journey's End (Approx. 17 minutes in length) Access Instructions: Go to steam library -> right-click "COSMONAUT" -> choose "properties" -> choose "BROWSE LOCAL FILES..." -> See sub-folder "COSMONAUT Original Soundtrack" Enjoy!Read full article on Community Announcements (NeonChasmDev)Patch NotesOfficial
COSMONAUT Original Soundtrack Update!
The COSMONAUT Original Soundtrack is now included with each game purchase at no additional charge: http://cdn.edgecast.steamstatic.com/steamcommunity/public/images/clans/31482134/19db05d174e4138a5dae8a4646e478a26a8a321a.jpg 01. (1:26) Menu Theme 02. (1:39) Crossing the Rubicon 03. (2:15) Prologue Ship 04. (1:02) Tetherless 05. (2:14) The Chasm's Edge 06. (1:34) Glass House 07. (2:13) Sanctuary 08. (1:29) S I M O N 09. (3:01) A Journey's End (Approx. 17 minutes in length) Access Instructions: Go to steam library -> right-click "COSMONAUT" -> choose "properties" -> choose "BROWSE LOCAL FILES..." -> See sub-folder "COSMONAUT Original Soundtrack" Enjoy!Read full article on Community Announcements (NeonChasmDev)Press Coverage
Unknown Pleasures: The best five unsung games on Steam this week
Studies say that this week is the best week of the year to move house for gillionth time, attempt the thirteenth Herculean task of speaking to the one human in a Royal Mail call centre, then injure your back. Anti-frustration, then, would be a perfect theme for this week’s Unknown Pleasures. Washing down an inadequate course of ibuprofen this week: artificial mortality, shotgun-based exploration, and zero gravity monster-dodging. (more…)Read full article on Rock, Paper, Shotgun
