Excellent concept! I'd love to see this expanded to become a puzzle game similar to a match-three but in 3d and with all the interesting physics interactions you have going on here. Original and fresh! Great work.

Sometimes cheap thrills are the best ones.

Very original, add some timers or scoring and an online scoreboard, and you got an instant hit.

I won!

Anyway, it was fun to play. Generally felt nice :)

Fun idea!

Fun concept, well executed :)

Very nice!
A very simple idea and added fun events to it. This just needs a timer/bonus counter plus scoring and it's a winner.

excellent concept but easily defeated by rapidly clicking!

This was a cool idea!

simple, light and fun. very tactile. nice scope. fun idea.

Thanks for all the comments.
I've added a timer (two actually) - you can get it here
http://dl.dropbox.com/u/7760581/BallPit/WebPlayer.html

You now need to finish before the outer timer. The inner timer is to stop click spamming :)