WHOH. This is nuts. So much Slayer!
First, don't take the "low" score personally - I'm trying to review so that 5 is the average. Besides, review scores don't count for anything anyways, and I don't really vote. :p
My favorite part is that section that starts at :45. That's a really interesting idea that I'd like to see developed a little more.
On the other hand, I felt that some of your melodies are kind of random-sounding. I'd like to see a little more melodic coherence throughout the song.