Crap!
I like Nintendo, but why Sonic?! He's Sega damnit!
Anyway, you did something that the submit page said NOT TO DO! Here, lemme quote it since you apparently missed it...
"The worst is when a user imports a song that is longer than their movie. Their exported Flash file includes a 3 minute song, and users only hear the first minute. Flash doesn't crop the audio unless you have it set to STREAM."
While you didn't do excatly that, there was a big lot of white, with music in the backround...
It will decrease the filesize 10-fold to crop, loop, and compress your music.
(If you don't have a music editor, download a simple MP3 to WAV converter, and use the "sound recorder" to crop it yourself!)
Better luck next time...*blam*