I feel the intro is a little long and could use a touch more variation. The lead guitar from 1:15 (ish) is great, good job not falling into the stereotype with that. The understated percussion that comes in later on in the track fits very nicely and the guitar/piano combo works really well at that point. Actually, that part of the song, when the choir comes in, reminded me of the Dr Who soundtrack (which is a big compliment, just so you know).
Quite a long but varied piece of music, but you kept my interest until the end.
A few tips on orchestral: String instruments have a natural legato transition when being played and tend to not leave long quiet gaps between notes. 0: to 0: you can hear those clearly, all you need to do is bring the midi notes closer together or overlap them.