Single-player games like Alt Oxygen
Below are 9 single-player Steam games similar to Alt Oxygen, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Alt Oxygen page.
Ranked picks
- 1
House Of Horror: Outside Is Better
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
House of Horror: Outside Is Better is a first-person psychological survival horror game with FPS mechanics. Explore a facility consumed by madness, solve puzzles, manage scarce resources, and survive using your wits and a dynamo-powered flashlight, where every shadow can become a deadly threat.
- 2
Pleiades - A Subversion Saga Game
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
A sci-fi, horror, thriller, mystery and conspiracy fps.
- 3
The Seasons Collection: Spring
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Start your journey as Cyrus to find your sister, Ava in Spring. The first game of The Seasons Collection involves brilliant FPS gameplay with a beautiful story to remember. All you will have is a rifle, a shotgun and limitless enemies as you start discovering the mystery of the forest.
- 4
Not Enough Space
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Land with your friends on the surface of various planets, gather resources, create items and buildings, defeat enemies and move to other planets to discover their secrets and secrets
- 5
LIFE EFFECT Survival
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Survive in a harsh and dangerous world after an alien invasion. Gather resources, craft equipment, fight mutants and massive monsters, use weapons, vehicles and robots, explore territories, defend strongholds and fight for survival.
- 6
Space Accident VR
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Step into the future with our groundbreaking VR game set in the year 2119, where humanity embarks on a historic journey into space. Join the "CCM-1" (Callisto Colonization Mission) expedition, aimed at the enigmatic moon of Jupiter - Callisto.
- 7
The Dark Side of the Moon: An Interactive FMV Thriller
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
When his 2 young children vanish mysteriously throughout the night, it's up to single-dad Dean Hamilton to do what any good dad would do: Go to the end of the universe and bring them back home in this thrilling FMV/Interactive Movie.
- 8
Zapling Bygone
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Zapling Bygone is a twisted metroidvania where you murder your foes and steal their abilities by wearing their skulls and absorbing their consciousness into your hive-mind.
- 9
Panic
Single-player alternative to Alt Oxygen — playable solo, no multiplayer required. Shares Action and Indie with Alt Oxygen.
Panic is a single-player, horror game that puts you in the shoes of David, a young man who struggles with mental disorders. As you join him on his journey you will discover an immersive narrative experience that will stay with you long after you finish your journey.