Art style reminds me a lot of Neutronized's games (in a good way!! I love that art style, so naturally I love this too)
Really creative concept.
Was gonna criticize the level select screen as unnecessary at first before I realized that it was the only thing that motivated me to complete the whole game since I knew how much content there was and how much I had left.
Also, love the squash and stretch on the ball. Not really the easiest thing to do with pixel art, but it looks great.