Not Bad at all.
This is quite a good time waster, and challenging as well in the higher levels.
Graphically it's simple, but not overly complicated so you can really focus on just playing.
So good job.
Just one minor note, it is fairly easy to avoid the 8 balls by right-clicking the mouse, then left clicking in another location. This quickly moves the 'pocket' out of the way of on coming obstacles, so makes the game a little easier to play.
All in all, not a bad job. 8/10!