Games like Christmas Soul
Games like Christmas Soul include Hollow Knight, Rogue Legacy 2, Ori and the Will of the Wisps, Hollow Knight: Silksong, and Nine Sols. We matched them by the tags players give Christmas Soul on Steam (Platformer, 2D Platformer, Action, Adventure, and Arcade): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Metroidvania · 2D

Rogue Legacy 2
Shared: Platformer · Arcade · Action

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

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

Nine Sols
Shared: Platformer · Metroidvania · Action

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

SANABI
Shared: Action · 2D Platformer · Adventure

Dead Cells
Shared: Adventure · Metroidvania · Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Owlboy
Shared: Platformer · Adventure · Metroidvania

Sonic Superstars
Shared: Platformer · Action · 2D Platformer

Blasphemous 2
Shared: Adventure · 2D Platformer · Metroidvania

Neva
Shared: Platformer · Adventure · Atmospheric

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · Action · 2D Platformer

SHINOBI: Art of Vengeance
Shared: 2D Platformer · Platformer · Action

Guacamelee! Super Turbo Championship Edition
Shared: Platformer · Action · Metroidvania

Rain World
Shared: Atmospheric · Platformer · 2D Platformer

MIO: Memories in Orbit
Shared: Platformer · Metroidvania · Atmospheric

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

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

Celeste
Shared: Platformer · 2D Platformer · Adventure

Super Mombo Quest
Shared: Action · Adventure · Platformer

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

Laika: Aged Through Blood
Shared: 2D Platformer · Arcade · Platformer