Games like The Curse
Games like The Curse include Firework, Tiny Bunny, Sally Face - Episode One, Poppy Playtime, and No, I'm not a Human. We matched them by the tags players give The Curse on Steam (Singleplayer, Visual Novel, Psychological Horror, Horror, and Dark): closest matches first, and among equally close ones the better-known games.

Firework
Shared: Horror · Psychological Horror · Singleplayer

Tiny Bunny
Shared: Visual Novel · Horror · Psychological Horror

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

Poppy Playtime
Shared: Singleplayer · Horror · Psychological Horror

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

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

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

KinitoPET
Shared: Psychological Horror · Horror · 2D

Danganronpa: Trigger Happy Havoc
Shared: Visual Novel · Singleplayer · Mystery

Danganronpa 2: Goodbye Despair
Shared: Visual Novel · Singleplayer · Mystery

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

Urban Myth Dissolution Center
Shared: Visual Novel · Psychological Horror · Singleplayer

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

Little Nightmares II
Shared: Singleplayer · Horror · Dark

Higurashi When They Cry Hou - Ch.2 Watanagashi
Shared: Visual Novel · Horror · Psychological Horror

Raging Loop
Shared: Visual Novel · Psychological Horror · Mystery

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

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

Mouthwashing
Shared: Psychological Horror · Horror · Dark

Danganronpa V3: Killing Harmony
Shared: Visual Novel · Singleplayer · Mystery

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

Fran Bow
Shared: Psychological Horror · Horror · Singleplayer

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

MiSide
Shared: Psychological Horror · Singleplayer · Horror