Games like Demon Peak
Games like Demon Peak include Hollow Knight, Skul: The Hero Slayer, Hollow Knight: Silksong, Gato Roboto, and Dead Cells. We matched them by the tags players give Demon Peak on Steam (Action, Adventure, Indie, Metroidvania, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Platformer · Indie

Skul: The Hero Slayer
Shared: Action · Indie · Pixel Graphics

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

Gato Roboto
Shared: Action · Indie · Metroidvania

Dead Cells
Shared: Adventure · Metroidvania · Pixel Graphics

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Indie · Platformer

Axiom Verge
Shared: Indie · Metroidvania · Action

SANABI
Shared: Action · Pixel Graphics · Adventure

The Messenger
Shared: Metroidvania · Pixel Graphics · Platformer

Blasphemous
Shared: Metroidvania · Pixel Graphics · Indie

Dust: An Elysian Tail
Shared: Action · Indie · Metroidvania

Bloodstained: Curse of the Moon
Shared: Action · Pixel Graphics · Metroidvania

Ori and the Will of the Wisps
Shared: Metroidvania · Action · Adventure

CARRION
Shared: Action · Metroidvania · Pixel Graphics

Out There Somewhere
Shared: Indie · Adventure · Pixel Graphics

Broforce
Shared: Action · Pixel Graphics · 2D

Iconoclasts
Shared: Indie · Action · Metroidvania

Owlboy
Shared: Adventure · Indie · Pixel Graphics

Rogue Legacy
Shared: Indie · Action · Platformer

Rogue Legacy 2
Shared: Action · Metroidvania · Indie

Nine Sols
Shared: Metroidvania · Action · 2D

Jump King
Shared: Indie · Adventure · Pixel Graphics

Reventure
Shared: Adventure · Indie · Pixel Graphics

Environmental Station Alpha
Shared: Adventure · Metroidvania · Indie