Games like Project Valkyrie
Games like Project Valkyrie include Phasmophobia, Resident Evil 7 Biohazard, Poppy Playtime, Garten of Banban, and Superliminal. We matched them by the tags players give Project Valkyrie on Steam (Horror, Idler, Puzzle, Hidden Object, and Post-apocalyptic): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · VR · Psychological Horror

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

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

Garten of Banban
Shared: Horror · VR · Puzzle

Superliminal
Shared: Puzzle · Psychological · First-Person

FIVE NIGHTS AT FREDDY'S: HELP WANTED
Shared: VR · Horror · Psychological Horror

Inside the Backrooms
Shared: Horror · Puzzle · Psychological Horror

The Room Two
Shared: Puzzle · Horror · Hidden Object

Granny
Shared: Horror · VR · Puzzle

Buckshot Roulette
Shared: Horror · Psychological · First-Person

Little Nightmares II
Shared: Horror · Puzzle · Psychological Horror

In Sound Mind
Shared: Horror · Puzzle · Psychological Horror

Half-Life: Alyx
Shared: VR · Horror · First-Person

Fran Bow
Shared: Horror · Puzzle · Psychological Horror

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

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

Gorilla Tag
Shared: VR · Horror · Psychological Horror

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

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

BONEWORKS
Shared: VR · Puzzle · Action

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

Scanner Sombre
Shared: Horror · VR · Psychological Horror

Metel - Horror Escape
Shared: Horror · Puzzle · Hidden Object

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