Games like Observation Protocol
Games like Observation Protocol include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), Outlast, and Poppy Playtime. We matched them by the tags players give Observation Protocol on Steam (Horror, Psychological Horror, Adventure, Atmospheric, and First-Person): closest matches first, and among equally close ones the better-known games.
Firewatch
Shared: Adventure · Atmospheric · First-Person
What Remains of Edith Finch
Shared: Atmospheric · First-Person · Adventure
Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric
Outlast
Shared: Horror · Psychological Horror · First-Person
Poppy Playtime
Shared: Horror · First-Person · Psychological Horror
SOMA
Shared: Horror · Psychological Horror · Atmospheric
Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Psychological Horror
Outer Wilds
Shared: Exploration · Adventure · Mystery
Lethal Company
Shared: Horror · First-Person · Psychological Horror
MiSide
Shared: Psychological Horror · Horror · First-Person
Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person
No, I'm not a Human
Shared: Horror · Psychological Horror · Atmospheric
Fears to Fathom - Woodbury Getaway
Shared: Psychological Horror · Horror · Adventure
Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Singleplayer
The Park®
Shared: Horror · Psychological Horror · First-Person
Still Wakes the Deep
Shared: Horror · Psychological Horror · First-Person
The Vanishing of Ethan Carter
Shared: Atmospheric · Mystery · Horror
Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure
Scanner Sombre
Shared: Horror · Exploration · Atmospheric
Phasmophobia
Shared: Horror · Psychological Horror · First-Person
Garten of Banban
Shared: Horror · Psychological Horror · First-Person
Sally Face - Episode One
Shared: Psychological Horror · Horror · Adventure
Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Atmospheric
Subliminal
Shared: Psychological Horror · Atmospheric · Horror