Well, It's an interesting concept but needs some work. Acheivements would be nice and maybe a way to add power-ups would be cool too. It's good but can be better. 3/5
Good game overall but I have some suggestions.
1. Slow down the game a tad.
2. Have like a life powerup that gives you an extra life.
3. maybe different colored balls give you better a score if you hit them.
Other than these things I gave it a 4/5.