Cool! Overall, I really like the energy of the piece; it sounds very exciting. I especially liked the 7/8 section and how it leads up to the ending.
You might want to consider using more offbeat rhythms and rhythmic accents (perhaps a bass drum hit every so often on an off-beat?). If possible, listen to "Short Ride In A Fast Machine" by John Adams, since he does this very well.
Hope to hear more music from you in the future! Maybe you could give me some pointers for scoring for band, since I'm mostly an orchestra guy who wants to branch out...
