Mixing feels nice and so does the general feel of the piece, which I think you nailed quite well.

But it feels a tad too stereotypical to me. I - VI - III - VII is another progression that can be quite overused. Often, the way to make it our own is to make something, a melody line, a riff, a progression, a rhythm, something which we can say is made by *us* and not plausibly made by someone else. I've heard others along the same lines (especially Phyrnna's "Heroes' March"), which would ordinarily sound stereotypical, but it isn't, because of that identifying string melody.

TL;DR: Mixing and instrumentation seem to give me no trouble; it just feels a tad formulaic to me.