The mastering is kinda bad. Your limiter causes the volume to automatically lower/raise itself, which is obnoxious. You also have too much sustain on your crash cymbal, see if you make it decay faster. The only other criticism I have is that the instrument on 0:45 could use more oomph. In the original ogg, it's a highlight, but here it's more in the background.
I unfortunately don't have any good guitar samples, the only good lead I have is one I created myself. You can hear it in the "ERZ-Old" remix.