Games like Smelted Kin
Games like Smelted Kin include Hollow Knight, Ori and the Will of the Wisps, Hollow Knight: Silksong, Dust: An Elysian Tail, and Phoenotopia: Awakening. We matched them by the tags players give Smelted Kin on Steam (Action, Adventure, Metroidvania, 2D Platformer, and Sci-fi): 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 · Action · Platformer

Hollow Knight: Silksong
Shared: Metroidvania · Indie · Platformer

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

Phoenotopia: Awakening
Shared: Action · Adventure · Metroidvania

Nine Sols
Shared: Metroidvania · Action · Platformer

Rogue Legacy 2
Shared: Metroidvania · Action · Platformer

Gato Roboto
Shared: Action · Metroidvania · Adventure

MO:Astray
Shared: Action · Adventure · Platformer

SANABI
Shared: Action · Adventure · 2D Platformer

PRAGMATA
Shared: Action · Sci-fi · Adventure

Axiom Verge
Shared: Metroidvania · Action · Platformer

ANIMAL WELL
Shared: Metroidvania · Platformer · Adventure

Planet of Lana
Shared: Action · 2D Platformer · Puzzle Platformer

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

Öoo
Shared: Metroidvania · 2D Platformer · Puzzle Platformer

Owlboy
Shared: Adventure · Metroidvania · Platformer

Dead Cells
Shared: Adventure · Metroidvania · 2D

Ghost 1.0
Shared: Action · Metroidvania · Adventure

SteamWorld Dig 2
Shared: Adventure · Metroidvania · Action

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

Celeste
Shared: 2D Platformer · Platformer · Indie

Iconoclasts
Shared: Metroidvania · Action · Adventure

Out There Somewhere
Shared: Adventure · Platformer · Action