Simple but effective.
As almost everyone has said before me, it's very repetitive, but I think the simplicity gives it a nice edge, and I could easily see it being used in a game, because, even though it is a loop, it doesn't get boring.
The ending seemed like a bit of a letdown. You just ended it without any thought. In my opinion, a whole song should build up to the end, and this didn't at all..
[Review Request Club]