It's a good riff.
It's a good riff and it sure is heavy just like the name of it. D: Haha, anyway another piece that I hope did good in the contest that it was used for. Anyway, just like on most short pieces like this it sounds like something is missing or that it just needed something else. There isn't much you can do in such a short submission to make it like this though I suppose. Oh well, it's still pretty good.