Sounds like someone likes John Williams, as my buddy Chris said below. ;)
Sounds great! I think I've heard of you before indeed...
I just wish you used reverb... those trumpet staccatos are so dry (and almost everything else for that matter)! The mix doesn't sound very convincing because of the lack of reverb. Also, the area around 2:00 is too quiet to be the climax. Consider building up more around then- trombones doing some sort of counter-melody to what else is going on and such.
The flute melody at 0:57- instead of doubling on glock/celesta, have glock/celesta do arpeggios perhaps.
Consider using timpani (I hear a tiny bit of it only) and more bass in this. It feels kinda empty in that range). Another thing I felt was missing was high strings.
The brass work around 1:35 on is strange- the trombones are too quiet and the call-and-answer feels unbalanced. Maybe consider bringing in some strings.
There are some great ideas in this, you should consider working more on building what goes AROUND those ideas- counter melodies, motion of the piece, so the flow is a bit nicer. Also, consider playing around with more key changes. Great idea for climaxes. ;)
Above all, keep compos(ed/ing)!