Thanks for the game :)
The character controller has an interesting mechanic, but I felt it has too much juice. Charging a lot, going through entire rooms, with a TON of screen shake each time I hit the ball was boring. I felt like I was using some super special attack, but at each input, so it felt too much for nothing special at all.
Nothing told me about breaking the walls or destroy the eyes to clear the lasers, it was hard for me to figure it out, so I just moved around randomly, and I often had troubling moving when stucking the ball next to the wall or worse, in a corner. I realized very late that I could spam the ball a bit to move around faster, but with all the camera movements and shaking, it was hard to follow.
The game looks nice, I wonder how it would have looked like with a correct pixel ratio and a pixel perfect camera, but I'm sure it would have been really great. Cutscenes are a very very nice touch, it gives it a lot of personnality ! I especially liked the player getting hit during the intro, the animation was really fun :D
About the boss, he seemed to just dash and die when I met him.
Congrats for making this demo :) There are a few things to improve, but that can really enhance the overall quality !