Such a cool idea. Feels like so many pieces coming together, and, what do you know, they fit so well! I really appreciate the little difficulty settings, especially for someone as bad at games as I am, and especially for the sake of rating a jam entry. (I still struggled, haha.) And the simple geometric style that you've gone for suits the game quite nicely. The player's shape changing is a take on that style that I don't think I've seen before too; pretty cool!
Don't know that I have much in terms of feedback that hasn't already been said, especially because it can be difficult for me to gauge what was hard for me because of the game and what was hard for me because I am just no good at this type of game (or any type of game really).
Overall, excellent work!