Games like Red and the Deadly Sins
Games like Red and the Deadly Sins include Hollow Knight, Hollow Knight: Silksong, Ori and the Will of the Wisps, Seen, and Dust: An Elysian Tail. We matched them by the tags players give Red and the Deadly Sins on Steam (Action, Indie, Adventure, Early Access, and Platformer): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Metroidvania · Indie

Hollow Knight: Silksong
Shared: Indie · Metroidvania · Difficult

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

Seen
Shared: Indie · Adventure · Action

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

Nine Sols
Shared: Action · Metroidvania · Platformer

Hyper Light Drifter
Shared: Indie · Adventure · Action

Rogue Legacy 2
Shared: Action · Indie · Platformer

Celeste
Shared: Indie · Platformer · Difficult

Axiom Verge
Shared: Indie · Action · Metroidvania

GRIS
Shared: Indie · Adventure · Atmospheric

LIMBO
Shared: Indie · Platformer · Adventure

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

Geometry Dash
Shared: Difficult · Great Soundtrack · Platformer

Little Nightmares
Shared: Adventure · Atmospheric · Indie

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

The End Is Nigh
Shared: Indie · Platformer · Adventure

SANABI
Shared: Action · Adventure · Indie

Rain World
Shared: Indie · Atmospheric · Platformer

Deadlight
Shared: Action · Indie · Platformer

SteamWorld Dig 2
Shared: Adventure · Indie · Action

ENDER LILIES: Quietus of the Knights
Shared: Metroidvania · Indie · Atmospheric

Salt and Sanctuary
Shared: Metroidvania · Action · Indie

Bastion
Shared: Indie · Action · Great Soundtrack