Games like Paradox Protocol
Games like Paradox Protocol include Lethal Company, Outlast, Backrooms: Escape Together, The Outlast Trials, and Resident Evil 7 Biohazard. We matched them by the tags players give Paradox Protocol on Steam (Survival Horror, Procedural Generation, Psychological Horror, First-Person, and Atmospheric): closest matches first, and among equally close ones the better-known games.

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

Outlast
Shared: Survival Horror · First-Person · Horror

Backrooms: Escape Together
Shared: Survival Horror · Psychological Horror · Horror

The Outlast Trials
Shared: Survival Horror · Horror · Psychological Horror

Resident Evil 7 Biohazard
Shared: Survival Horror · First-Person · Horror

Resident Evil Village
Shared: Survival Horror · First-Person · Horror

Outlast 2
Shared: Survival Horror · Psychological Horror · Horror

Escape the Backrooms
Shared: Psychological Horror · Survival Horror · Horror

Inside the Backrooms
Shared: Survival Horror · Horror · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Alien: Isolation
Shared: Survival Horror · Horror · Atmospheric

The Forest
Shared: Horror · Survival Horror · First-Person

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

Hello Neighbor
Shared: First-Person · Survival Horror · Horror

METRO 2033 Redux
Shared: Atmospheric · Horror · First-Person

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

Species: Unknown
Shared: First-Person · Survival Horror · Horror

Content Warning
Shared: Procedural Generation · Horror · First-Person

Pacify
Shared: Survival Horror · Horror · Psychological Horror

Nuclear Nightmare
Shared: Survival Horror · First-Person · Psychological Horror

Dying Light
Shared: Survival Horror · Horror · First-Person

Dead by Daylight
Shared: Survival Horror · Horror · First-Person

PANICORE
Shared: Survival Horror · Psychological Horror · Horror

Visage
Shared: Survival Horror · Psychological Horror · Horror