I liked the concept quite a bit, although I will agree that the gameplay changes take a little while to kick in. I though the controls were tight and the game was fun enough (although I may be hindered by the fact I played on my own haha). That said, I'd love it if you tweaked the ball physics a little, because I found it rather easy to make it just bounce in a straight line, which is not exactly fun (an element of randomization to the bounce might do the trick here?) Finally, a bit of a pause or some other transitional element when the styles switch would be great to get the players prepared for having a new rule set. Overall, neat idea and good work on the execution!