Games like Knytt Underground
Games like Knytt Underground include Hollow Knight: Silksong, Hollow Knight, GRIS, Celeste, and Ori and the Will of the Wisps. We matched them by the tags players give Knytt Underground on Steam (Precision Platformer, Indie, Platformer, Adventure, and Exploration): closest matches first, and among equally close ones the better-known games.

Hollow Knight: Silksong
Shared: Indie · Metroidvania · Platformer

Hollow Knight
Shared: Platformer · Metroidvania · Indie

GRIS
Shared: Indie · Adventure · Platformer

Celeste
Shared: Precision Platformer · Indie · Platformer

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

ANIMAL WELL
Shared: Exploration · Metroidvania · Platformer

FEZ
Shared: Platformer · Indie · Exploration

LIMBO
Shared: Indie · Platformer · Adventure

Rain World
Shared: Indie · Exploration · Platformer

OneShot
Shared: Indie · Great Soundtrack · Adventure

Neva
Shared: Adventure · Platformer · Indie

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

Outer Wilds
Shared: Exploration · Adventure · Great Soundtrack

FAR: Lone Sails
Shared: Adventure · Indie · Exploration

Little Nightmares
Shared: Adventure · Indie · Atmospheric

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

Iconoclasts
Shared: Indie · Metroidvania · Adventure

What Remains of Edith Finch
Shared: Exploration · Adventure · Atmospheric

Axiom Verge
Shared: Indie · Platformer · Metroidvania

VVVVVV
Shared: Precision Platformer · Platformer · Indie

Contrast
Shared: Indie · Adventure · Female Protagonist

Journey
Shared: Indie · Adventure · Exploration

AER Memories of Old
Shared: Indie · Adventure · Exploration

Super Meat Boy
Shared: Precision Platformer · Platformer · Indie