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

Celeste
Shared: Precision Platformer · Difficult · 2D Platformer

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

SANABI
Shared: 2D Platformer · Pixel Graphics · Action

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

Jump King
Shared: Precision Platformer · Difficult · Platformer

LIMBO
Shared: Puzzle Platformer · Platformer · 2D

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

Hollow Knight
Shared: Platformer · Difficult · 2D

Rain World
Shared: Difficult · Platformer · 2D

Geometry Dash
Shared: Difficult · Precision Platformer · 2D

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

Katana ZERO
Shared: 2D Platformer · Platformer · Action

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

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

Webbed
Shared: 2D Platformer · Puzzle Platformer · Platformer

Ambidextro
Shared: Precision Platformer · 2D Platformer · Action

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

I wanna be the Creator
Shared: Platformer · Precision Platformer · Action-Adventure

Pizza Tower
Shared: 2D Platformer · Platformer · Pixel Graphics

Mina the Hollower
Shared: 2D Platformer · Action-Adventure · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · 2D · Pixel Graphics

Rusted Moss
Shared: Platformer · 2D Platformer · Precision Platformer

Skul: The Hero Slayer
Shared: Action · 2D · Platformer

Leap Year
Shared: Precision Platformer · 2D Platformer · Puzzle Platformer