Games like Bookey Manor
Games like Bookey Manor include Cookie Clicker, That's not my Neighbor, Firework, There Is No Game: Wrong Dimension, and American Arcadia. We matched them by the tags players give Bookey Manor on Steam (Casual, Horror, Point & Click, Incremental, and Thriller): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Horror · Casual · Incremental

That's not my Neighbor
Shared: Casual · Point & Click · Horror

Firework
Shared: Horror · 2D · Indie

There Is No Game: Wrong Dimension
Shared: Point & Click · Casual · Indie

American Arcadia
Shared: Point & Click · Singleplayer · Horror

Click the Button
Shared: Casual · Incremental · Point & Click

Horripilant
Shared: Horror · Incremental · Casual

Please, Don’t Touch Anything
Shared: Point & Click · Casual · Singleplayer

DISTRAINT 2
Shared: Horror · Point & Click · Singleplayer

Five Nights at Freddy's
Shared: Horror · Singleplayer · Point & Click

Fran Bow
Shared: Point & Click · Horror · Singleplayer

Tiny Bunny
Shared: Horror · Singleplayer · 2D

Little Misfortune
Shared: Point & Click · Horror · Indie

Gorogoa
Shared: Casual · Point & Click · Singleplayer

To The Core
Shared: Casual · Incremental · 2D

Paper Bride
Shared: Horror · 2D · Casual

Timberman
Shared: Casual · 2D · Indie

The Room
Shared: Point & Click · Singleplayer · Horror

Sally Face - Episode One
Shared: Horror · Point & Click · Indie

Happy Game
Shared: Horror · Casual · Singleplayer

Papers, Please
Shared: Point & Click · Singleplayer · Indie

Storyteller
Shared: Point & Click · 2D · Interactive Fiction

Game Dev Tycoon
Shared: Casual · Singleplayer · Indie

People Playground
Shared: 2D · Singleplayer · Gore