Very Fun
It was very challenging and very fun to play. I would have really liked it with more options, more levels, different sized balls etc. I agree that it was hard to understand what to do at first, so it might be a good idea to put clearer instructions. Also, in most cases, you didn't have to throw away the ball if you did something wrong, you could just change its colour or something.
Finished it second time =], can't wait for a sequel.