The combination of orchestral elements, synths, and industrial sounding percussion reminds me of the opening of Final Fantasy VII going into the Bombing Mission theme. I love that combination.
The part around 1:34 reminded me more of Underwater Frigate from Metroid Prime for some reason. I'm a sucker for that piano/harp combination you have you. I didn't like the color that the brass instrument introduced at 2:49. In a sense it did help transition to the following section, but it just didn't sit well with me for whatever reason.
I love your use of percussion throughout the piece. Starting at 1:56, I liked the chromatic movement and tension/resolution in the strings.
However, I didn't care for the beginning. The melodic material in the brass instrument felt weak to me. It also felt like the strings should have come down and allowed the brass to come more to the foreground. It's not particularly bad, but that section feels like the weakest in the piece. It didn't grab my attention, but I'm glad to have continued listening. And I'm sorry to say it, but I can't stand the ending. :p That motif feels very contrived. Rather than naturally fitting the piece, it feels inserted as if to say, "Okay, I guess it is time to end."
As a generality, I believe that a good music has a certain shape. It climaxes one time and then has falling action until the end. The problem with this piece is that it reaches it's strong point in the section starting around :58. The part starting at 3:00 has a bit more instrumentation but otherwise does little to nothing to set itself higher up in terms of tension, energy, and excitement. The consequence is that the end feels like more of the same and thus loses any feeling of momentum. The overall shape of the piece becomes relatively flat. This, to me, is by far the biggest issue with the composition.
As a whole, I really enjoyed listening to this piece. It has an epic sort of feel to it with some very colorful instrumentation. However, the sense of forward momentum, shape, and direction is hindered by a somewhat bland final section. Work on shape more in future pieces and you'll be golden.
Very nice.