Games like The Unknown
Games like The Unknown include Hollow Knight, Dust: An Elysian Tail, Hollow Knight: Silksong, Skul: The Hero Slayer, and Rogue Legacy 2. We matched them by the tags players give The Unknown on Steam (Indie, Casual, Action, Adventure, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Indie · Platformer · Metroidvania

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

Hollow Knight: Silksong
Shared: Indie · Metroidvania · Singleplayer

Skul: The Hero Slayer
Shared: Indie · Action · Singleplayer

Rogue Legacy 2
Shared: Indie · Action · Platformer

Ori and the Will of the Wisps
Shared: Action · Singleplayer · Platformer

Dead Cells
Shared: Adventure · Metroidvania · 2D

Blasphemous
Shared: Indie · Metroidvania · Dark Fantasy

Rogue Legacy
Shared: Indie · Action · Platformer

Nine Sols
Shared: Action · Metroidvania · Indie

SANABI
Shared: Action · Adventure · Indie

BEEP
Shared: Indie · Adventure · Platformer

SteamWorld Dig 2
Shared: Indie · Adventure · Action

Vampire Survivors
Shared: Indie · Casual · Singleplayer

Monster Boy and the Cursed Kingdom
Shared: Indie · Action · Adventure

UnEpic
Shared: Indie · Action · Platformer

Owlboy
Shared: Indie · Adventure · Platformer

Super Fancy Pants Adventure
Shared: Indie · Action · Adventure

Minimalism
Shared: Indie · Casual · Action

Gato Roboto
Shared: Indie · Action · Adventure

Salt and Sanctuary
Shared: Dark Fantasy · Action · Metroidvania

Pikuniku
Shared: Indie · Casual · Adventure

Shovel Knight: Treasure Trove
Shared: Indie · Platformer · Adventure

F.I.S.T.: Forged In Shadow Torch
Shared: Action · Adventure · Platformer