You should use better lighting and a higher frame rate camera. Perhaps a professional microphone would help the sound quality. Your video would also benefit from some editing, there's quite a dip in the action around act 2.
Hey yo, I'm tuned to G. To answer your second question, check out my "one man metal band" videos on here, specifically video 2 will show you how to get this sound. Thanks a bunch for the brutal comments!!!!!