Games like Clostrophobia: Vol 1
Games like Clostrophobia: Vol 1 include Poppy Playtime, Firewatch, The Exit 8, What Remains of Edith Finch, and Inside the Backrooms. We matched them by the tags players give Clostrophobia: Vol 1 on Steam (Adventure, Horror, Puzzle, Perma Death, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · First-Person

Firewatch
Shared: Adventure · Walking Simulator · First-Person

The Exit 8
Shared: Puzzle · Horror · Exploration

What Remains of Edith Finch
Shared: Adventure · Walking Simulator · First-Person

Inside the Backrooms
Shared: Horror · Puzzle · Adventure

Outer Wilds
Shared: Adventure · Exploration · Puzzle

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

The Forest
Shared: Horror · Adventure · First-Person

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

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

Scanner Sombre
Shared: Horror · Adventure · Walking Simulator

Amanda the Adventurer
Shared: Horror · Puzzle · First-Person

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

INFRA
Shared: Puzzle · Adventure · Exploration

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

SOMA
Shared: Horror · Exploration · First-Person

Outlast
Shared: Horror · First-Person · Adventure

Lethal Company
Shared: Horror · First-Person · Exploration

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · First-Person

Backrooms: Escape Together
Shared: Horror · First-Person · Adventure

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

Among the Sleep - Enhanced Edition
Shared: Horror · Adventure · First-Person

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

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