Unstoppaball has just been released on Brass Monkey, a relatively new gaming-portal with a neat twist.
On Brass Monkey you connect your Android- or iPhone via wi-fi, and can then use the phone as controller. In the case of Unstoppaball, you control the Ball by tilting the phone.
Check it out!
(It's based on the free web-version, not the iOS-version, which you can still get here)