The source code isn't painfully bloated, although it certainly has plenty of obvious inefficiencies and could probably be shrunk by a factor of 2 pretty easily. For one thing, the programmer doesn't seem to know about the "Line" command when drawing the arrows; he does them pixel by pixel.

One flaw in the gameplay is that extraneous keypresses aren't penalized, so it's possible to get a rating of 100 percent just by repeatedly mashing all the arrow keys at once. Once you figure this out, the game loses its challenge.