Games like Atheris
Games like Atheris include SOMA, Dead Space, Lethal Company, SILENT HILL 2, and Outer Wilds. We matched them by the tags players give Atheris on Steam (Survival Horror, Psychological Horror, Horror, Atmospheric, and Sci-fi): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Dead Space
Shared: Survival Horror · Horror · Psychological Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

SILENT HILL 2
Shared: Psychological Horror · Horror · Survival Horror

Outer Wilds
Shared: Story Rich · Mystery · Space

Alien: Isolation
Shared: Survival Horror · Horror · Sci-fi

Dead Space (2008)
Shared: Horror · Survival Horror · Sci-fi

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

Darkwood
Shared: Survival Horror · Horror · Psychological Horror

Outlast
Shared: Survival Horror · Horror · Psychological Horror

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Prey
Shared: Sci-fi · Horror · Atmospheric

Alan Wake
Shared: Horror · Story Rich · Atmospheric

SILENT HILL f
Shared: Psychological Horror · Horror · Survival Horror

Pacify
Shared: Horror · Psychological Horror · Survival Horror

ROUTINE
Shared: Psychological Horror · Sci-fi · Atmospheric

SIGNALIS
Shared: Survival Horror · Psychological Horror · Atmospheric

Outlast 2
Shared: Psychological Horror · Survival Horror · Horror

Sally Face - Episode One
Shared: Psychological Horror · Horror · Story Rich

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

The Callisto Protocol™
Shared: Survival Horror · Horror · Sci-fi

The Evil Within 2
Shared: Survival Horror · Horror · Psychological Horror

No, I'm not a Human
Shared: Psychological Horror · Horror · Atmospheric

Dead Space™ 2
Shared: Survival Horror · Horror · Story Rich