Games like RETRIEVAL
Games like RETRIEVAL include MiSide, Mouthwashing, Amnesia: A Machine For Pigs, Layers of Fear (2016), and Firewatch. We matched them by the tags players give RETRIEVAL on Steam (Psychological Horror, Horror, First-Person, Pixel Graphics, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · Horror · First-Person

Mouthwashing
Shared: Psychological Horror · Horror · Story Rich

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

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

Firewatch
Shared: Adventure · Walking Simulator · First-Person

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

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

SOMA
Shared: Psychological Horror · Horror · Story Rich

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

KARMA: The Dark World
Shared: Psychological Horror · Horror · Walking Simulator

OMORI
Shared: Psychological Horror · Pixel Graphics · Story Rich

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Blair Witch
Shared: Horror · Psychological Horror · First-Person

Summer of '58
Shared: Horror · Psychological Horror · First-Person

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

The Park®
Shared: Psychological Horror · Horror · First-Person

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

DISTRAINT: Deluxe Edition
Shared: Psychological Horror · Horror · Pixel Graphics

Kiosk
Shared: Psychological Horror · Horror · Pixel Graphics

Outlast
Shared: Horror · First-Person · Psychological Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · First-Person

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

The Exit 8
Shared: Horror · Psychological Horror · Walking Simulator