Can I give a suggestion ? What if you put an option to the volume of the computer (or even the own game) affect the beat? Like, if you are alone in home and is playing this game, you enable this option, and you turn up the volume to maximum, the beat in the game will be stronger and the screen will shake even more. But if you disable this option, even at low volume, the beat and the shaking will be in the same. How about that?
 "Vector Stunt"){kind=icon}
 "Step Seq."){kind=icon}
 "Toss the Turtle"){kind=icon}
 "Platform Racing 2"){kind=icon}
 "Don't Smoke That Rock!"){kind=icon}