Due to some iPad specific code, I have disabled running this app directly on the desktop.
However, I have created a desktop version for Safari, Chrome, Firefox, Opera, and IE9. This version does not save your scores and the color input is different, but it is otherwise the same.
Check it out here.
This webapp was created for iPad and can not (currently) be run on an iPhone or iPod Touch.
One last step! To use this app on your iPad it must be installed and run from the home screen. Tap the "+" button in the menubar and choose "Add to Home Screen".