Games like Mortanis Prisoners
Games like Mortanis Prisoners include Resident Evil 7 Biohazard, Resident Evil Village, Outlast, Resident Evil 2, and Outlast 2. We matched them by the tags players give Mortanis Prisoners on Steam (Combat, Supernatural, Survival Horror, Horror, and Atmospheric): closest matches first, and among equally close ones the better-known games.

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

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

Outlast
Shared: Horror · Survival Horror · First-Person

Resident Evil 2
Shared: Survival Horror · Horror · Singleplayer

Outlast 2
Shared: Horror · Survival Horror · First-Person

Resident Evil 3
Shared: Horror · Survival Horror · Female Protagonist

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

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

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

SOMA
Shared: Horror · Atmospheric · Survival Horror

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

Alien: Isolation
Shared: Survival Horror · Horror · Atmospheric

The Beast Inside
Shared: Horror · Survival Horror · First-Person

Resident Evil 4
Shared: Horror · Survival Horror · Singleplayer

Dead by Daylight
Shared: Horror · Survival Horror · Gore

Metro Exodus
Shared: Atmospheric · Horror · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · First-Person

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

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

Bendy and the Dark Revival
Shared: Horror · Survival Horror · First-Person

Ghostwire: Tokyo
Shared: Supernatural · Horror · First-Person

The Evil Within 2
Shared: Survival Horror · Horror · Gore

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

Half-Life: Alyx
Shared: Horror · Female Protagonist · First-Person