Games like The Overdreamer
Games like The Overdreamer include ICEY, LIMBO, Tales of the Black Forest, DISTRAINT: Deluxe Edition, and The Vagrant. We matched them by the tags players give The Overdreamer on Steam (Adventure, Indie, Horror, Side Scroller, and 2D): closest matches first, and among equally close ones the better-known games.

ICEY
Shared: Adventure · Female Protagonist · Side Scroller

LIMBO
Shared: Indie · Adventure · 2D

Tales of the Black Forest
Shared: Horror · Indie · Adventure

DISTRAINT: Deluxe Edition
Shared: Indie · Horror · Adventure

The Vagrant
Shared: Female Protagonist · 2D · Adventure

Hollow Knight: Silksong
Shared: Indie · 2D · Adventure

The Coma 2: Vicious Sisters
Shared: Adventure · Horror · Indie

The Witch's House MV
Shared: Horror · Indie · 2D

Five Nights at Freddy's: Into the Pit
Shared: Adventure · Horror · 2D

GRIS
Shared: Indie · Adventure · Female Protagonist

Little Misfortune
Shared: Indie · Adventure · Horror

Bladed fury
Shared: Indie · Adventure · Female Protagonist

DreadOut
Shared: Indie · Adventure · Horror

The Cat Lady
Shared: Adventure · Horror · Indie

Little Nightmares
Shared: Adventure · Horror · Indie

Sally Face - Episode One
Shared: Indie · Horror · Adventure

Detention
Shared: Indie · Horror · Adventure

The Fall
Shared: Adventure · Indie · Side Scroller

Firework
Shared: Indie · Horror · 2D

Cat in the Box
Shared: Adventure · Horror · Indie

Deadlight
Shared: Indie · Adventure · Side Scroller

Celeste
Shared: Indie · Female Protagonist · Adventure

Fran Bow
Shared: Adventure · Horror · Indie

Ib
Shared: Horror · Indie · 2D