Ok.
Its an ok piece of work. I understand that its a demo for a remix, so im giving ye full points. IT just sounds a bit chunky. Try getting a band to play this instead of a comp (which I know is reallyfrigginhard!!!) But if ye do, it will sound a ton smoother in the transitions. Also, the band might be able to make it sound more like the song, without it being an exact copy with a little affects. Its not that hard to customize the song once ye can play it on piano, guitar, or bass. Then ye have the halo kinda feel and its still unique. Btw, the halo 3 theme is just perfect for a remix. Im working on a personal one on the piano right now.