Games like SCP: Descent
Games like SCP: Descent include Poppy Playtime, Buckshot Roulette, Amnesia: The Dark Descent, Outlast, and Little Nightmares II. We matched them by the tags players give SCP: Descent on Steam (Horror, Puzzle, Lovecraftian, 1980s, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · First-Person

Buckshot Roulette
Shared: Horror · First-Person · Dark

Amnesia: The Dark Descent
Shared: Horror · Puzzle · Atmospheric

Outlast
Shared: Horror · Atmospheric · First-Person

Little Nightmares II
Shared: Horror · Puzzle · Atmospheric

Garten of Banban
Shared: Horror · Puzzle · First-Person

Scorn
Shared: Horror · Puzzle · Atmospheric

SOMA
Shared: Horror · Atmospheric · Lovecraftian

Backrooms: Escape Together
Shared: Horror · Atmospheric · Realistic

Bendy and the Ink Machine
Shared: Horror · Puzzle · First-Person

Little Nightmares
Shared: Horror · Atmospheric · Puzzle

Inside the Backrooms
Shared: Horror · Puzzle · Atmospheric

The Room Two
Shared: Puzzle · Horror · Atmospheric

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

Garten of Banban 2
Shared: Horror · Puzzle · First-Person

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

Amnesia: Rebirth
Shared: Puzzle · Horror · First-Person

Ready or Not
Shared: Horror · Realistic · First-Person

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

LIMBO
Shared: Puzzle · Atmospheric · Horror

Layers of Fear (2016)
Shared: Horror · Atmospheric · First-Person

Garten of Banban 3
Shared: Horror · Puzzle · First-Person

The Room
Shared: Puzzle · Atmospheric · Horror

The Room Three
Shared: Puzzle · Atmospheric · Lovecraftian