Cute art, but repitive visuals
Well, I didn't like the song (you didn't cite it in the file info area, but one of the reviews says it was System of a Down), but the art work was most certainly very nicely done. My only reason why the graphics aren't higher is because of the composition/usage. Alot was repeatitive and so much more could have been done with a Chu Chu. That rolling field scene... it was so long and so... empty.
It may not have the feel of the original Japanese commercial (I mean, come on! No blood or violence?!) but it was interesting to see them... with asses?
Compliments to your optimizing, though. I would have imagined that song should have bumped up the file size far more, but what a quick load that was!