not bad at all!
I didn't play a long time but that's because I'm a little tired... but the game is good! The variation you made from the classic use of a pad and a ball in a game is quite nice. I suppose you can't play for hours because of the routine and the difficulty (I was a little messy with only 3 balls, so...) but the game is good!
bravo
2 things, though :
the animation of the smoke when the ball hit the pad could be a liiiiitlllllle beter... with more frames and a slower vanishing...
and the screen is a bit too small... my cursor was often off-stage and I think that when you're juggling with 23415 balls, it must be a problem...