Games like Hollow Knight
Games like Hollow Knight include Hollow Knight: Silksong, Nine Sols, Ori and the Will of the Wisps, ENDER LILIES: Quietus of the Knights, and Blasphemous. We matched them by the tags players give Hollow Knight on Steam (Metroidvania, Platformer, Souls-like, Difficult, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight: Silksong
Shared: Metroidvania · Difficult · Souls-like

Nine Sols
Shared: Metroidvania · Souls-like · Difficult

Ori and the Will of the Wisps
Shared: Metroidvania · Platformer · Great Soundtrack

ENDER LILIES: Quietus of the Knights
Shared: Metroidvania · Souls-like · Great Soundtrack

Blasphemous
Shared: Metroidvania · Souls-like · 2D

Salt and Sanctuary
Shared: Metroidvania · Souls-like · Difficult

Celeste
Shared: Difficult · Platformer · Great Soundtrack

Rain World
Shared: Difficult · Platformer · Indie

MIO: Memories in Orbit
Shared: Metroidvania · Platformer · Exploration

DARK SOULS™ III
Shared: Souls-like · Difficult · Atmospheric

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

Dead Cells
Shared: Metroidvania · Souls-like · 2D

GRIS
Shared: Great Soundtrack · Platformer · Indie

Cuphead
Shared: Difficult · Platformer · Great Soundtrack

Geometry Dash
Shared: Difficult · Great Soundtrack · 2D

Axiom Verge
Shared: Metroidvania · Platformer · Indie

Hyper Light Drifter
Shared: Great Soundtrack · Difficult · Indie

Deaths Gambit: Afterlife
Shared: Metroidvania · Souls-like · 2D

ENDER MAGNOLIA: Bloom in the Mist
Shared: Metroidvania · 2D · Souls-like

Aeterna Noctis
Shared: Metroidvania · Platformer · Difficult

Unbound: Worlds Apart
Shared: Platformer · Metroidvania · Indie

La-Mulana
Shared: Metroidvania · Platformer · Difficult

Rogue Legacy 2
Shared: Metroidvania · Platformer · Indie

Skul: The Hero Slayer
Shared: Indie · Platformer · 2D