This is a really impressive tech demo. It works surprisingly well. I have noticed a pattern in the other comments though (specifically for Android devices) about the jittery-ness. I think a simple solution to that would be to either do a rolling average of the samples as they are streamed from the device. This will bring the peaks and valleys closer together smoothing things out.
Overall I think this game has potential Im looking forward to what comes next.
Have you considered sending "events" back to the device, like making the phone vibrate if the player loses, or haptic feedback when the ball bumps a wall?
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I totally agree on the jitteryness - a little low-pass filtering should go a long way. It would be *super* cool to send events back to the device, especially anything haptic. I'm trying to come up with an idea that requires the play to interact with the mobile browser on a regular basis - this would prevent the device auto-locking and interrupting the gameplay. Thanks for the feedback!