#2
Drums and Rhythm are fairly muddy, maybe open them up with EQ and compression. Vocal and leads are great.
#3
As far as the quality...I agree with PCP on that one and drums need to come up. I really dig the music and guitar playing, cool riffs. Not my thing vocally, so I'm not much of a judge, sounds consistent with that style as far as I've heard it.

Collaborating long distance huh? Cool..seeing more and more of that these days. Musicians without borders!