Games like Observer Protocol: The Station - Second Shift
Games like Observer Protocol: The Station - Second Shift include Phasmophobia, MiSide, Five Nights at Freddy's, The Room Two, and Iron Lung. We matched them by the tags players give Observer Protocol: The Station - Second Shift on Steam (Horror, Psychological Horror, Hidden Object, Interactive Fiction, and Investigation): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Psychological Horror · Investigation

MiSide
Shared: Psychological Horror · Horror · First-Person

Five Nights at Freddy's
Shared: Horror · Psychological Horror · Point & Click

The Room Two
Shared: Horror · Hidden Object · Point & Click

Iron Lung
Shared: Horror · Psychological Horror · Indie

Lethal Company
Shared: Horror · Psychological Horror · First-Person

Slay the Princess — The Pristine Cut
Shared: Psychological Horror · Horror · Interactive Fiction

Dollmare
Shared: Horror · Psychological Horror · Simulation

The Cabin Factory
Shared: Horror · Psychological Horror · First-Person

Dagon: by H. P. Lovecraft
Shared: Horror · Psychological Horror · Interactive Fiction

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

Platform 8
Shared: Psychological Horror · Hidden Object · Simulation

Outlast
Shared: Horror · Psychological Horror · First-Person

[Chillas Art] Shinkansen 0 0
Shared: Horror · Psychological Horror · Investigation

SOMA
Shared: Horror · Psychological Horror · First-Person

Sally Face - Episode One
Shared: Psychological Horror · Horror · Point & Click

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

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

Desktop Explorer
Shared: Psychological Horror · Point & Click · Investigation

Five Nights at Freddy's 2
Shared: Horror · Psychological Horror · First-Person

Subliminal
Shared: Psychological Horror · Horror · Realistic

Demonologist
Shared: Horror · Psychological Horror · Investigation

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

Kiosk
Shared: Horror · Psychological Horror · First-Person