So let me get this out of the way first, you're making music for the new Batman movie right? If not, they should fire that guy and hire you.
This is some seriously great work. The instruments sound amazing, the progression of the piece is brilliant, and the balance is superb. The only complain I have is that the whole piece is a bit quite, even when it gets loud, I had to up my volume quite a bit to get it where I wanted it. That said, it took two seconds to up my volume, and it sounds amazing now. Great work on this, it's clear you put a lot of work into it.
You've done an epic job on this piece, Nick! I do have a few critiques, but on the whole I really enjoy what you've done here.
At 0:20, I'd drop a low, quiet F# octave in the left hand, just to give the string entrance a little more emphasis.
Your cymbals sound just a bit dry in comparison to the other instruments; perhaps just a touch more reverb on those?
The fade-out of the violins/violas playing the main theme at 1:46-1:49 ish is a little too quick- perhaps you could start the fade earlier.
The violin at the end of the piece sounds great (is that the Gypsy violin?) but it probably should rest for a beat or two at 2:30- just to provide a little bit of contrast.
Anyway, all of these are just tiny nitpicks- I loved the piece as a whole!
Please contact me if you would like to use this in a project. We can discuss the details.