Games like Up All Night: Daybreak
Games like Up All Night: Daybreak include Mouthwashing, Tiny Bunny, Firework, Dagon: by H. P. Lovecraft, and No, I'm not a Human. We matched them by the tags players give Up All Night: Daybreak on Steam (Visual Novel, Vampires, Psychological Horror, Horror, and Thriller): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

Tiny Bunny
Shared: Visual Novel · Horror · Psychological Horror

Firework
Shared: Horror · Psychological Horror · Visual Novel

Dagon: by H. P. Lovecraft
Shared: Visual Novel · Horror · Psychological Horror

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

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Milk inside a bag of milk inside a bag of milk
Shared: Visual Novel · Psychological Horror · Horror

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Psychological Horror · Horror

Summer of '58
Shared: Horror · Psychological Horror · Thriller

SOMA
Shared: Psychological Horror · Horror · Dark

Detention
Shared: Horror · Psychological Horror · Atmospheric

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

MiSide
Shared: Psychological Horror · Horror · Thriller

Pumpkin Eater
Shared: Visual Novel · Psychological Horror · Thriller

Outlast 2
Shared: Psychological Horror · Horror · Dark

Fran Bow
Shared: Psychological Horror · Horror · Dark

Buckshot Roulette
Shared: Horror · Dark · Psychological Horror

The Coffin of Andy and Leyley
Shared: Visual Novel · Psychological Horror · Psychological

The House in Fata Morgana
Shared: Visual Novel · Psychological Horror · Horror

DISTRAINT: Deluxe Edition
Shared: Psychological Horror · Horror · Dark

Vampire: The Masquerade - Coteries of New York
Shared: Visual Novel · Vampires · Dark

Fears to Fathom - Norwood Hitchhike
Shared: Psychological Horror · Horror · Thriller