Games like Slumbering Feline - Nightmare
Games like Slumbering Feline - Nightmare include Hollow Knight, Hollow Knight: Silksong, Ori and the Will of the Wisps, Dead Cells, and SANABI. We matched them by the tags players give Slumbering Feline - Nightmare on Steam (Adventure, Metroidvania, Pixel Graphics, Action-Adventure, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Metroidvania · Platformer · 2D

Hollow Knight: Silksong
Shared: Metroidvania · 2D · Adventure

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

Dead Cells
Shared: Adventure · Metroidvania · Pixel Graphics

SANABI
Shared: Pixel Graphics · Adventure · 2D

Owlboy
Shared: Adventure · Pixel Graphics · Metroidvania

ANIMAL WELL
Shared: Metroidvania · Pixel Graphics · Exploration

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

Momodora: Reverie Under The Moonlight
Shared: Metroidvania · Pixel Graphics · Side Scroller

Skul: The Hero Slayer
Shared: Pixel Graphics · 2D · Metroidvania

Axiom Verge
Shared: Metroidvania · Pixel Graphics · Adventure

Rain World
Shared: Pixel Graphics · 2D · Exploration

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

Touhou Luna Nights
Shared: Metroidvania · Side Scroller · Action-Adventure

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

The Messenger
Shared: Metroidvania · Pixel Graphics · Platformer

Gato Roboto
Shared: Metroidvania · Adventure · Pixel Graphics

Blasphemous 2
Shared: Metroidvania · Adventure · Pixel Graphics

9 Years of Shadows
Shared: Metroidvania · Pixel Graphics · Side Scroller

Blasphemous
Shared: Metroidvania · Pixel Graphics · 2D

Haiku, the Robot
Shared: Adventure · Metroidvania · Pixel Graphics

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

MIO: Memories in Orbit
Shared: Metroidvania · Platformer · Action-Adventure

Bloodstained: Curse of the Moon
Shared: Pixel Graphics · Metroidvania · 2D