What did you use to record it? It sounds a little dull.
But man, it really shows the qualities of the War Pig well.
It sounds REALLY tight, you can hear all the notes very evenly and clearly, even though they' just powerchords. And the fast legato thing you did sounded REALLY pronounced, defined and organic. That's the power of the War Pig, definition. Basicly sounds the same as my 6 string, when I tune my E string down to B. Lovely pickup.
Playing was pretty good. Yeah, you missed up a little bit here and there, but hey, you're only human. I take that you sat down and really concentrated, instead of playing like you'd normally when you're good, like on stage.
The best tip anyone ever gave me about guitar playing was (albeit in a diffrent genre, but should aply here too): move to the beat of the song, dance around, be lively. I guess in Metal I'd headbang (I do it when I play fast stuff on my bass with the band), not 'cause it looks cool', but cause you're keeping time really well that way. I always try to move around, groove, or atleast tap my foot or something. Helps get rid of that bzz... bzz... RECORDING - Don't $% up tension, too, when you're just playing naturally like that, focusing on your feeling more.