Games like Beyond the Door
Games like Beyond the Door include Poppy Playtime, Firewatch, The Room, Sally Face - Episode One, and The Room Two. We matched them by the tags players give Beyond the Door on Steam (Horror, Adventure, Hidden Object, Indie, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Firewatch
Shared: Adventure · Story Rich · First-Person

The Room
Shared: Adventure · Mystery · Hidden Object

Sally Face - Episode One
Shared: Horror · Indie · Story Rich

The Room Two
Shared: Horror · Hidden Object · Mystery

The Room Three
Shared: Adventure · Mystery · Indie

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

What Remains of Edith Finch
Shared: Story Rich · Adventure · First-Person

The Room 4: Old Sins
Shared: Adventure · Mystery · Hidden Object

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

MiSide
Shared: Horror · Story Rich · First-Person

Little Nightmares
Shared: Horror · Adventure · Indie

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

Outer Wilds
Shared: Adventure · Mystery · Story Rich

Little Nightmares II
Shared: Horror · Adventure · Dark

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

Buckshot Roulette
Shared: Horror · First-Person · Dark

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

Outlast
Shared: Horror · First-Person · Adventure

Blair Witch
Shared: Horror · Adventure · Indie

INSIDE
Shared: Horror · Indie · Dark

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

CARIMARA: Beneath the forlorn limbs
Shared: Adventure · Horror · Mystery

Metel - Horror Escape
Shared: Horror · Indie · First-Person