I like the structure, especially the big crescendo at the beginning. It really adds dramatic flair, and *immediately* caught my attention. About the only critique I have is that, although your melodies are really great and catchy, they seem to wander a bit as a full structure. It would be nice to hear more of what you'd call the "main" theme, just to solidify the piece as a whole.
That's a really minor critique, however, and overall I love the piece.