ok these are basically a few ideas me and a friend had, first attempts really at writing stuff, and some of it doesnt really sound metally :P.

if leaving feedback, please refer to each one as 'song 1', 'song 2' etc

Alot of times you were out of key (IE, all the notes you used didn't fit well together) as is ever apparent in song 4 at the first part with the distortion and acoustic. You just need to work on that and don't make them so happy sounding...

I also noticed that you don't know that riffs don't always consist of powerchords

I think song 3 and 4 had the most going for them.