Games like The Klown
Games like The Klown include Hollow Knight, Ori and the Will of the Wisps, Little Nightmares, Bloodstained: Ritual of the Night, and Nine Sols. We matched them by the tags players give The Klown on Steam (Puzzle Platformer, Adventure, Metroidvania, Story Rich, and Dark Fantasy): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Platformer · Adventure

Ori and the Will of the Wisps
Shared: Metroidvania · Adventure · Story Rich

Little Nightmares
Shared: Adventure · Puzzle Platformer · Story Rich

Bloodstained: Ritual of the Night
Shared: Metroidvania · Adventure · Dark Fantasy

Nine Sols
Shared: Metroidvania · Story Rich · Platformer

The Witcher 3: Wild Hunt — Remastered
Shared: Story Rich · Adventure · RPG

Dust: An Elysian Tail
Shared: Metroidvania · Adventure · Platformer

F.I.S.T.: Forged In Shadow Torch
Shared: Metroidvania · Adventure · Story Rich

Owlboy
Shared: Adventure · Metroidvania · Story Rich

Hollow Knight: Silksong
Shared: Metroidvania · Adventure · Indie

INSIDE
Shared: Puzzle Platformer · Story Rich · Adventure

Iconoclasts
Shared: Metroidvania · Adventure · Story Rich

Black Myth: Wukong
Shared: Story Rich · Dark Fantasy · Adventure

Little Nightmares II
Shared: Adventure · Story Rich · Psychological Horror

Portal 2
Shared: Puzzle Platformer · Story Rich · Platformer

Dread Delusion
Shared: Adventure · Dark Fantasy · Story Rich

Salt and Sanctuary
Shared: Metroidvania · Dark Fantasy · Platformer

Dead Cells
Shared: Adventure · Metroidvania · Dark Fantasy

SANABI
Shared: Story Rich · Adventure · Action

ANIMAL WELL
Shared: Metroidvania · Puzzle Platformer · Adventure

Rogue Legacy 2
Shared: Metroidvania · Adventure · Platformer

Blasphemous
Shared: Metroidvania · Dark Fantasy · Adventure

OMORI
Shared: Story Rich · Psychological Horror · Adventure

Deaths Gambit: Afterlife
Shared: Metroidvania · Dark Fantasy · Adventure