Better than I thought it would be from the screens

I think you should add a screenshot with more colored balls on the Play Store. Looking really solid, I like the twisting transitions. Reminded me of playing International Karate + on Amiga where you block bouncing balls with a shield on one of the bonus stages.
One thing though. I can't quit the game without using the Task Manager. In Android 2.3.x (which about half of all Android devices use) it is common to exit apps using the back button. Actually, it is common to use the back button to exit out to main menu etc. The keycode for this in AppGameKit is 27, same as Esc on a keyboard. So you can use GetRawKeyPressed( 27 ) to get input from this.
Also, your icon does not use transparency so it has white corners. You should use a 32 bit PNG with transparency for your icon.

Demo 3 is out now!