Games like Cyan Heart
Games like Cyan Heart include SOMA, Mouthwashing, Layers of Fear (2016), KARMA: The Dark World, and ROUTINE. We matched them by the tags players give Cyan Heart on Steam (Psychological Horror, Sci-fi, Atmospheric, Psychological, and Psychedelic): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Psychological Horror · Atmospheric · Sci-fi

Mouthwashing
Shared: Psychological Horror · Atmospheric · Horror

Layers of Fear (2016)
Shared: Psychological Horror · Atmospheric · Horror

KARMA: The Dark World
Shared: Psychological Horror · Atmospheric · Sci-fi

ROUTINE
Shared: Sci-fi · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Walking Simulator · Psychological Horror

Fran Bow
Shared: Psychological Horror · Horror · Atmospheric

SILENT HILL 2
Shared: Psychological Horror · Atmospheric · Horror

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Psychological · Horror

SIGNALIS
Shared: Psychological Horror · Sci-fi · Atmospheric

The Medium
Shared: Psychological Horror · Atmospheric · Horror

Little Nightmares
Shared: Atmospheric · Horror · Psychological Horror

Little Nightmares II
Shared: Horror · Psychological Horror · Atmospheric

Layers of Fear 2 (2019)
Shared: Psychological Horror · Atmospheric · Horror

Still Wakes the Deep
Shared: Psychological Horror · Horror · Atmospheric

Outer Wilds
Shared: Atmospheric · Exploration · Sci-fi

Detention
Shared: Psychological Horror · Atmospheric · Horror

SILENT HILL f
Shared: Psychological Horror · Horror · Psychological

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Sally Face - Episode One
Shared: Psychological Horror · Horror · Atmospheric

>observer_
Shared: Psychological Horror · Atmospheric · Sci-fi

Lethal Company
Shared: Horror · Psychological Horror · Sci-fi

The Cat Lady
Shared: Psychological Horror · Horror · Atmospheric

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