Addictive demo! I want more!
Exceptionally well made demo. This has great potential to become a very addictive game. Add in a storyline, levels, different ball types (exploding, water, snake, etc), maybe some enemy's and boss levels and this can become a great little money-maker for you. I can see this as a popular game app on the I-Phone or Android platforms.
Just the little you have here is addictive, imagine what a full game could be?
Keep up the great work!