I really like the simplistic graphics, it's nice and clean, gives me a happy vibe in combination with the music! I'd recommend making the movement relative to the camera angle, meaning: forward on the camera, is the way the ball will move when I press W. I also honestly don't like the spinning mechanic in later levels. It just makes me pretty dizzy and sick and not wanting to complete the game. It's a challenge, yes, but not in the right way :P I also feel like making the ball arbitrarily slow in the pink level makes it just more boring, not more interesting. The levels also don't feel challenging enough right now, they could be a lot harder. Still, I think this game and artstyle has potential if you find new and interesting gameplay mechanics in favour of the current ones. Good luck and good job ;)