It's an interesting idea, but at first I accidentally picked something up and scored 550 points. I don't understand why, but overall it's an interesting game, if you don't take into account the mistakes.
Well that's certainly not what I was expecting, pretty much everything seen in that screenshot should be impossible. There are 11 balls on the field, but only 10 spawn at the start of the game and they only respawn when another ball is discarded. Then there's the huge stack, every ball except for the bottom one has the same size and sprite, which probably means that the same ball was cloned 300 times. Looking at the code the only way this could have happened is if an error was thrown after spawning the ball but before setting its position, which would also explain why they have the same color and size. Could you check if there are any errors on the console when this happens? I'd really like to know exactly where it's crashing. Thanks for your help!