Nice work...
...but I do have some suggestions for improvement. First, it's obvious to me that you transposed your width and height when you entered your file's information. Switch those around, and it'll make the movie look larger, as well as remove those unsightly margins. Second, I'm not sure if the end of the movie is supposed to run concurrent with the music or not, but the music cut short about six or seven seconds before the movie was over. Third, I suggest lowering the quality of your background audio file. I understand that it may be important, but you can save a megabyte or two this way on movie filesize. And fourth, the animation looked a little jerky in places. I don't know if that's my computer's fault or the movie's fault, but look into it.
Don't let this get you down. You did well.