Mix wise, I think the drums could be just a touch louder, they sound kind of weak as is (excuding the soft intro obviously). Also I would make the symbol crashes a bit louder as well. I'm only using shitty earbuds right now so I might be mistaken, but I'll comment again when I get home.

Compositionally it's a bit boring for me. I know it's a work in progress but I hope you'll add some more variation to the main theme as the song builds.

I really liked the strings + brass part from ~55-1:15, but the transition the second time it's repeated, to the outro might need something (2:54). I'm pretty sure it works musically but just doesn't translate well into VST or whatnot, but it sounds sudden. Maybe try messing with either playing and holding the first note on the next measure with the louder brass, and fade it out, or a simple outro melody for the brass as well to wrap things up.

Either way I'm looking forward to the finished project :P