Games like Adam's Forgotten Secrets
Games like Adam's Forgotten Secrets include Poppy Playtime, Phasmophobia, Sally Face - Episode One, Pacify, and Outlast. We matched them by the tags players give Adam's Forgotten Secrets on Steam (1990's, Psychological Horror, Horror, Supernatural, and Indie): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

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

Pacify
Shared: Horror · Psychological Horror · Supernatural

Outlast
Shared: Horror · Psychological Horror · Survival Horror

Five Nights at Freddy's
Shared: Horror · Psychological Horror · Indie

Resident Evil 4
Shared: Horror · Action · Survival Horror

Darkwood
Shared: Horror · Psychological Horror · Survival Horror

Firework
Shared: Horror · Indie · Psychological Horror

Outlast 2
Shared: Psychological Horror · Horror · Survival Horror

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

Resident Evil Village
Shared: Horror · Survival Horror · Action

DreadOut
Shared: Horror · Indie · Supernatural

Five Nights at Freddy's 2
Shared: Horror · Psychological Horror · Indie

SOMA
Shared: Psychological Horror · Horror · Dark

Getting Over It with Bennett Foddy
Shared: Psychological Horror · Horror · Indie

The Outlast Trials
Shared: Horror · Psychological Horror · Survival Horror

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

No, I'm not a Human
Shared: Psychological Horror · Horror · Indie

Resident Evil 7 Biohazard
Shared: Horror · Psychological Horror · Survival Horror

Crow Country
Shared: 1990's · Horror · Psychological Horror

Slender: The Arrival
Shared: Horror · Indie · Psychological Horror

Resident Evil Requiem
Shared: Horror · Survival Horror · Action

Little Nightmares
Shared: Horror · Indie · Psychological Horror