The lead style is very Pantera-ish. The playing is very clean, pretty faultless alternate picking really, and cool harmonics also. Your tone is pretty nice. I like the background riff. I guess the only negative point is that it was kinda repetetive, you used mostly the same kind of lead licks all the way through. Since you said it was more of jam rather than a full song, that's not so important though. Anyway, I liked it, excellent technique.