Games like Parnitha: Patient 66
Games like Parnitha: Patient 66 include SOMA, MiSide, Outer Wilds, Sally Face - Episode One, and What Remains of Edith Finch. We matched them by the tags players give Parnitha: Patient 66 on Steam (Psychological Horror, Hidden Object, Story Rich, Mystery Dungeon, and Puzzle): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Psychological Horror · Story Rich · Exploration

MiSide
Shared: Psychological Horror · Story Rich · First-Person

Outer Wilds
Shared: Story Rich · Exploration · Puzzle

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

What Remains of Edith Finch
Shared: Story Rich · Exploration · First-Person

Platform 8
Shared: Psychological Horror · Hidden Object · Puzzle

Poppy Playtime
Shared: Puzzle · Psychological Horror · First-Person

Fran Bow
Shared: Psychological Horror · Story Rich · Puzzle

Layers of Fear (2016)
Shared: Psychological Horror · Story Rich · First-Person

Detention
Shared: Psychological Horror · Story Rich · Puzzle

Mouthwashing
Shared: Psychological Horror · Story Rich · Horror

The Room Two
Shared: Puzzle · Hidden Object · Psychological Horror

Amnesia: The Dark Descent
Shared: Psychological Horror · Puzzle · Horror

Little Nightmares II
Shared: Psychological Horror · Puzzle · Story Rich

Inside the Backrooms
Shared: Psychological Horror · Puzzle · Horror

Firewatch
Shared: Story Rich · Adventure · Exploration

Still Wakes the Deep
Shared: Psychological Horror · Story Rich · First-Person

The Room 4: Old Sins
Shared: Puzzle · Hidden Object · Story Rich

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

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Exploration · Horror

The Room Three
Shared: Puzzle · Hidden Object · Adventure

Amnesia: Rebirth
Shared: Story Rich · Puzzle · First-Person

In Sound Mind
Shared: Psychological Horror · Story Rich · Puzzle

Amnesia: A Machine For Pigs
Shared: Story Rich · Psychological Horror · Exploration