Games like The DEEP Abyss
Games like The DEEP Abyss include Outlast, Outlast 2, Resident Evil Village, Resident Evil 7 Biohazard, and Poppy Playtime. We matched them by the tags players give The DEEP Abyss on Steam (Horror, Psychological Horror, Psychological, First-Person, and Action): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · First-Person · Psychological Horror

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

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

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

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

The Forest
Shared: Horror · Adventure · Survival

The Outlast Trials
Shared: Horror · Psychological Horror · First-Person

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

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

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

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

Darkwood
Shared: Horror · Psychological Horror · Action

Resident Evil Requiem
Shared: Horror · Action · Survival Horror

Buckshot Roulette
Shared: Horror · First-Person · Psychological

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

METRO 2033 Redux
Shared: Horror · FPS · Action

SOMA
Shared: Horror · Psychological Horror · First-Person

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · First-Person

SILENT HILL: Townfall
Shared: Horror · Psychological Horror · Action

Dead by Daylight
Shared: Horror · Survival Horror · Survival

Metro Exodus
Shared: FPS · Horror · Action

SILENT HILL f
Shared: Horror · Psychological Horror · Psychological

SILENT HILL 2
Shared: Horror · Psychological Horror · Psychological

Slender: The Arrival
Shared: Horror · First-Person · Psychological Horror