This really shows that you have the ears of a composer!
I think Rick Marin had his head on straight when he contacted you to do music for Primal War. Plus, you are the king of Newgrounds' Classical Music section, although you now have competition from Solus Lunes, Stephan Wells, and Papkee. You should consider teaming up with other NG users. (I suggested you to Xionico and Maelstormm.)
Instrumentation: It's obvious that you must either A) be classically trained or B) listened & studied the right material because your usage of strings, percussion, and brass were excellent. With that being said, I suggest you expand your instrument roster to include reeds, woodwinds, and world-related instruments to help keep things fresh.
Composition: The melody that you had going set a powerful yet down-to-earth atmosphere. Plus, the rhythm adds to that brand of exhilaration. I can definitely hear this in several flash submissions already. Of course, if you do decide to add on to this, I would recommend creating a backup in case something goes wrong.
Other: There's not much else that I can comment on here really considering that it's an original.
Overall: Bosa, here's a ten from me. (5/5)