Games like Elemental Odyssey
Games like Elemental Odyssey include Celeste, Downwell, Super Meat Boy, Geometry Dash, and Skul: The Hero Slayer. We matched them by the tags players give Elemental Odyssey on Steam (Indie, Precision Platformer, Platformer, Difficult, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Difficult · Indie

Downwell
Shared: Precision Platformer · Indie · Platformer

Super Meat Boy
Shared: Precision Platformer · Platformer · Indie

Geometry Dash
Shared: Difficult · Precision Platformer · Platformer

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

Spelunky
Shared: Platformer · Indie · Difficult

Hollow Knight
Shared: Platformer · Difficult · Indie

Rogue Legacy 2
Shared: Platformer · Indie · Arcade

SANABI
Shared: Action · 2D Platformer · Indie

Risk of Rain (2013)
Shared: Indie · Platformer · Roguelike

The Binding of Isaac: Rebirth
Shared: Indie · Difficult · Roguelike

Rogue Legacy
Shared: Indie · Platformer · Roguelike

VVVVVV
Shared: Precision Platformer · Indie · Platformer

Jump King
Shared: Precision Platformer · Indie · Difficult

Katana ZERO
Shared: Platformer · Action · Indie

Hollow Knight: Silksong
Shared: Indie · Difficult · Platformer

Noita
Shared: Difficult · Indie · Roguelike

Only Climb: Better Together
Shared: Precision Platformer · Platformer · Difficult

Vampire Survivors
Shared: Indie · Action Roguelike · Roguelike

The Binding of Isaac
Shared: Indie · Difficult · Roguelike

Spelunky 2
Shared: Platformer · Difficult · 2D Platformer

Rain World
Shared: Difficult · Indie · Platformer

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

Enter the Gungeon
Shared: Indie · Difficult · Roguelike