Games like Nixxsz Castle
Games like Nixxsz Castle include Celeste, Super Meat Boy, SANABI, VVVVVV, and Geometry Dash. We matched them by the tags players give Nixxsz Castle on Steam (2D, Difficult, 2D Platformer, Precision Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Difficult · Precision Platformer · 2D Platformer

Super Meat Boy
Shared: Difficult · Precision Platformer · 2D Platformer

SANABI
Shared: 2D Platformer · 2D · Pixel Graphics

VVVVVV
Shared: Precision Platformer · 2D Platformer · Difficult

Geometry Dash
Shared: Difficult · 2D · Precision Platformer

Jump King
Shared: Difficult · Precision Platformer · 2D

Downwell
Shared: Precision Platformer · 2D Platformer · Indie

Out There Somewhere
Shared: 2D · Indie · Pixel Graphics

Hollow Knight: Silksong
Shared: Difficult · 2D · Indie

LIMBO
Shared: Puzzle Platformer · 2D · Indie

Braid
Shared: 2D Platformer · Puzzle Platformer · 2D

Shovel Knight: Treasure Trove
Shared: 2D · Difficult · Indie

Hollow Knight
Shared: Difficult · 2D · Indie

Pizza Tower
Shared: 2D Platformer · Indie · 2D

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

Rain World
Shared: Difficult · 2D · Indie

Defy Gravity Extended
Shared: Puzzle Platformer · 2D · Indie

UFO 50
Shared: 2D · Indie · Retro

The Messenger
Shared: 2D · Retro · 2D Platformer

The End Is Nigh
Shared: Precision Platformer · Difficult · 2D

SUPER CHICKEN JUMPER
Shared: 2D · Difficult · Anime

Webbed
Shared: 2D Platformer · 2D · Puzzle Platformer

Skul: The Hero Slayer
Shared: 2D · Indie · Difficult

Katana ZERO
Shared: 2D Platformer · 2D · Pixel Graphics