I like the idea, though the game itself feels a bit imbalanced! Even from the first level the 'boss' moves faster than you, and seems to catch up to the ball with ease even when it bounces off the square in the middle, whereas the player has a hard time catching it if it goes the wrong way. I also wish you could catch the ball with the corner of your paddle to have it bounce the other way and hopefully surprise the AI. Graphically it´s a bit limited too, though the style does go well with the classic Pong games, so if that's intentional I can see the intention. :)
I like the idea, and the upgrades, but feels like either the AI is a bit too good, or it takes a bit too much grind to start playing against it, even at the very first stage. Good idea, though, and thanks for fixing the bug!
-cd-