Games like Slime's Journey
Games like Slime's Journey include SANABI, Momodora: Reverie Under The Moonlight, Blasphemous 2, Skul: The Hero Slayer, and The Messenger. We matched them by the tags players give Slime's Journey on Steam (Metroidvania, 2D Platformer, Action-Adventure, Pixel Graphics, and Platformer): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Pixel Graphics · 2D Platformer · Action

Momodora: Reverie Under The Moonlight
Shared: Metroidvania · 2D Platformer · Pixel Graphics

Blasphemous 2
Shared: Metroidvania · 2D Platformer · Pixel Graphics

Skul: The Hero Slayer
Shared: Pixel Graphics · Action · Metroidvania

The Messenger
Shared: Metroidvania · Platformer · Pixel Graphics

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

Owlboy
Shared: Pixel Graphics · Metroidvania · Platformer

Hollow Knight
Shared: Metroidvania · Platformer · 2D

Momodora: Moonlit Farewell
Shared: Metroidvania · Pixel Graphics · Action-Adventure

Dead Cells
Shared: Metroidvania · Adventure · Pixel Graphics

Gato Roboto
Shared: Metroidvania · Pixel Graphics · Action

Iconoclasts
Shared: Metroidvania · Pixel Graphics · Adventure

Rabi-Ribi
Shared: Metroidvania · Pixel Graphics · Action-Adventure

Celeste
Shared: Pixel Graphics · 2D Platformer · Platformer

Webbed
Shared: 2D Platformer · Pixel Graphics · Platformer

Prince of Persia The Lost Crown
Shared: Metroidvania · 2D Platformer · Side Scroller

Well Dweller
Shared: Metroidvania · Action-Adventure · 2D Platformer

Blasphemous
Shared: Metroidvania · Pixel Graphics · 2D

Axiom Verge 2
Shared: Metroidvania · 2D Platformer · Platformer

Monster Boy and the Cursed Kingdom
Shared: Metroidvania · Adventure · Platformer

Bloodstained: Curse of the Moon
Shared: Pixel Graphics · Metroidvania · Platformer

9 Years of Shadows
Shared: Metroidvania · Platformer · Side Scroller

TEVI
Shared: Metroidvania · Pixel Graphics · Action-Adventure

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Platformer · Adventure