I would take down the feedback effects at the beginning... they are a little too annoying at that volume level.
The snare sounds like a walmart snare... no actual snare sound to it... all deadened attack and thats it. I dont know if its the poor quality MP3 thats making it sound so bad, but i have a feeling that it was a recording problem (mic placement, tuning of drum).
Also, I would try to smoothen that bass guitar a little... give it a little less uncontrolled growl and more refined texture.
Otherwise, its hard to tell how your mix is without vocals and a better quality (not to mention longer) MP3.