I played this game on stream: https://www.twitch.tv/videos/2559949482?t=01h09m15s
Overall, the concept of punching the ball to solve the puzzles was interesting, and the graphics style was great! I like the references to Mario without being outright Mario. However, the control of the ball was frustrating, and it was difficult to get the ball to do what I wanted it to do.
I think some tweaking of the ball dynamics may help, I'm not sure what exactly, but making it easier for the player to control :)
The tutorial was nice, and seemed maybe even harder to complete than the first level. I got stuck at one point because I went to a previous room and didn't realize it (my fault), and then spent a long time getting the ball to stay in the circle. It should really be easier to get the ball to stay in place..
Fun concept! Some tweaking of the ball control would make this game much much more fun.