I really like your concept and mechanic in this game.I feel like this game have potential to be a viral mobile game because it is easy to pick up but you also need to try hard to get a really high score. For suggestion i think maybe you can tune the ball's speed and physics a little bit more. The ball's starting speed is really slow so when it bounces multiple times the game would go really slow, however when it falls for a long time it gains too much speed so there would not be enough time left for the player to react. Maybe you can try to let the ball go faster and have a smaller accelaration, and you can try adding the speed in later levels. Also you can add more things in the game like different floor shapes to make the levels have more variaty. I think this game's mechanic gives it a really solid base and I really like it!