Overall, pretty damn good!
Really well written piece. It's awesome for boss battle type of music. The only problem I have with it is that at some points there's this one layer of sound. I don't know how to describe it, but it's kind of like a higher pitched, really short and fast string part. It works in some parts of the piece, but in other (most noticeably for me with the choral vocals) it's just kind of distracting. Overall, really great piece.!