you could spruce it up alot
This was pretty nice to listen to. Although the transition between bars seemed rigid, because you're using loops and such. I seemed to drag on and on with that one riff during the middle. I like the beginning how you muted the drums every once in awhile. It's little things like that that are cool.
The fading that you did at the end of the measure souned silly and didn't fit well coming into the next guitar riff. I think it owuld have sounded better if you left the levels alone and instead, add some really crazy drums to make somewhat of a climax in the song when the guitar changes. Somethin.