Really fun concept! Loved all the shapeshifting elements. Loved being able to just mow through the enemies with fire mode! Music is such a bop! I liked that depending on your enemies and environment you needed to use different forms which makes sense. Art looks good, I liked the eye glow and background. I liked the variety of enemies. You could just treat this game as a platformer and storm through them if you want in water mode which I found quite funny.
I think you could do more with each element. Perhaps a secondary attack. Your UI was simple and easily told the player. I also encountered a bug where it spawned me in the middle of the level on the final segment, but only triggered that once.
Great job! Gotta new follower on your soundcloud!