Games like Ouroboros: Prelude
Games like Ouroboros: Prelude include Amnesia: The Dark Descent, Scorn, SOMA, Outlast 2, and Outlast. We matched them by the tags players give Ouroboros: Prelude on Steam (Indie, Early Access, Gore, Violent, and Nudity): closest matches first, and among equally close ones the better-known games.

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

Scorn
Shared: Gore · Horror · Nudity

SOMA
Shared: Horror · Gore · Dark

Outlast 2
Shared: Gore · Horror · Violent

Outlast
Shared: Horror · Gore · First-Person

Still Wakes the Deep
Shared: Gore · Horror · Lovecraftian

Lucius
Shared: Gore · Indie · Horror

Dead by Daylight
Shared: Gore · Horror · Violent

Granny: Chapter Two
Shared: Indie · Gore · Violent

Clive Barker's Hellraiser: Revival
Shared: Gore · Nudity · Horror

FAITH: The Unholy Trinity
Shared: Indie · Horror · Gore

Manhunt
Shared: Gore · Violent · Horror

Resident Evil 7 Biohazard
Shared: Horror · Gore · Violent

CARRION
Shared: Gore · Indie · Violent

Little Nightmares
Shared: Horror · Indie · Dark

Palmyra Orphanage
Shared: Indie · Violent · Horror

Buckshot Roulette
Shared: Indie · Dark · Horror

Mouthwashing
Shared: Indie · Horror · Gore

Poppy Playtime
Shared: Horror · Indie · Puzzle

Bendy and the Ink Machine
Shared: Horror · Indie · Puzzle

Unforgiving - A Northern Hymn
Shared: Indie · Horror · Nudity

Detention
Shared: Indie · Horror · Puzzle

Sally Face - Episode One
Shared: Indie · Horror · Dark

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