Interesting concept! I found the game very fun, when you are able to think a path and hit the enemy just in time is really satisfying!
In my opinion there is something to polish in the controls. They feel a bit inconsistent at times. There is a bug where the player character start to floating around that happens quite often. I encountered also some various visual bugs.
A little side note, the tutorial is good, but I didn't understood at first that platforms has a sort of cooldown after you leave them. I didn't immediately understand it because in the part where you explain that using a platform as an obstacle that block your path, there's a bit of space on the sides. After some attempt I went through there XD
About the graphic I like the minimalist style, I don't know if you plan to change that in the future, but I think that some small adjustment in the UI could improve the visual impact a lot. Just some little change in shapes and colors. For example, the slider below is hard to grasp that is the enemy health bar and clash with the other game element.
Overall the game is very promising and fun to play. I loved sounds and boss abilities! And for me the difficulty is well balanced, it's a nice challenge but it never becomes frustrating ^^