Beat Hazard Ultra
Beat Hazard Ultra is a twin-stick shooter that uses music to dictate the gameplay. The louder and more intense the music, the more powerful your weapons become and the more bad guys you'll have to face on screen. The game comes with several original tracks for you to play around in, but the real fun comes from using your own music. If your iPad is too full of games and doesn't have any music on it, you can also connect to one of several online radio stations that play different genres of music.
We only covered a fraction of the games available in the App Store and there are loads more to be discovered. If you have a favorite game that you think everyone should play, feel free to leave it in the comments below.