Games like Knock On The Window
Games like Knock On The Window include MiSide, Poppy Playtime, Outlast, SOMA, and No, I'm not a Human. We matched them by the tags players give Knock On The Window on Steam (Horror, Psychological Horror, Atmospheric, Comedy, and Story Rich): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · Horror · Story Rich

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

Outlast
Shared: Horror · Atmospheric · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Firewatch
Shared: Atmospheric · Story Rich · Singleplayer

Little Nightmares II
Shared: Horror · Atmospheric · Singleplayer

Outlast 2
Shared: Horror · Psychological Horror · First-Person

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

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

Little Nightmares
Shared: Horror · Atmospheric · Singleplayer

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Alan Wake
Shared: Horror · Story Rich · Action

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

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

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · Atmospheric

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

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Story Rich

Fran Bow
Shared: Psychological Horror · Horror · Story Rich

Garten of Banban 2
Shared: Horror · Psychological Horror · Singleplayer

Still Wakes the Deep
Shared: Horror · Psychological Horror · Story Rich

METRO 2033 Redux
Shared: Atmospheric · Horror · Story Rich