Games like Deadnaut
Games like Deadnaut include Lethal Company, Prey, Dead Space, Content Warning, and No Man's Sky. We matched them by the tags players give Deadnaut on Steam (Action Roguelike, Space, Exploration, Immersive Sim, and Survival Horror): closest matches first, and among equally close ones the better-known games.

Lethal Company
Shared: Horror · Survival Horror · Exploration

Prey
Shared: Space · Immersive Sim · Sci-fi

Dead Space
Shared: Space · Survival Horror · Horror

Content Warning
Shared: Action Roguelike · Exploration · Horror

No Man's Sky
Shared: Space · Exploration · Sci-fi

FTL: Faster Than Light
Shared: Space · Sci-fi · Strategy

Alien: Isolation
Shared: Survival Horror · Horror · Space

Pacify
Shared: Horror · Exploration · Survival Horror

SOMA
Shared: Psychological Horror · Horror · Exploration

Darkwood
Shared: Survival Horror · Horror · Psychological Horror

Subnautica 2
Shared: Exploration · Horror · Survival

Amnesia: The Bunker
Shared: Survival Horror · Immersive Sim · Horror

Monstrum
Shared: Action Roguelike · Survival Horror · Horror

Stellaris
Shared: Space · Exploration · Sci-fi

Outer Wilds
Shared: Space · Exploration · Sci-fi

Five Nights at Freddy's 2
Shared: Survival Horror · Horror · Psychological Horror

Outlast
Shared: Survival Horror · Horror · Psychological Horror

Five Nights at Freddy's
Shared: Survival Horror · Horror · Psychological Horror

Dead by Daylight
Shared: Survival Horror · Horror · Survival

Ultimate Custom Night
Shared: Horror · Survival Horror · Strategy

Starfield
Shared: Space · Exploration · Sci-fi

Sons Of The Forest
Shared: Survival Horror · Survival · Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

Inside the Backrooms
Shared: Survival Horror · Horror · Psychological Horror