Demo it here: pubnub.com/developers/demos/pongnub/
Blog post & tutorial (w/ code!): pubnub.com/blog/building-a-browser-based-game-w-a-phone-controller/
Users can control their paddle in realtime using the control, with Pub/Sub Messaging (pubnub.com/how-it-works/data-streams/) taking care of streaming the signals.
All PubNub demos: pubnub.com/developers/demos/
Music: "ColoR Me," by Vinmara