This game is a good initial concept. I'm personally biased for super monkey ball inspired games. However, one thing that's very important for these games is the camera. The fan stage was far to difficult to complete due to the fixed camera. Also, resizing the ball need to be seamless. As the ball shrunk and grew, the player would bounce around. Consider finding a way to keep the balls contact point stable. But, I do find the idea of adding a size mechanic to the SMB formula. It is worth exploring.