Interesting...
I like the guitar sound you picked. It sounds a lot like Mnemic's guitars. Not the style so much, but the actual sound itself when hitting those low notes in the riffs.
I like the hit near the 1:20 mark. That section is really cool, especially when you expand it near the 1:35 mark. That makes it really kickin'! Fucking groovy, and cathartic.
Not the riff around the 2:05 mark is fucking kickass! I LOVE that section! And it just keeps getting heavier as you progress through that riff into the next little sub-section.
Oh, and then the clean guitar section has a nifty little feel to it. I'm not really sure it fits with the song or not, but I like it anyways. The solo though is fucking awesome! Even though it kinda repeats itself. Maybe you didn't really consider it a solo, but rather another riff in a descant role. If so then perfectly done it was!
My only issue is the lack of fullness. Either you need to mix this into a richer sound, or add some extra stuff to it. Vocals always help, but that is not always an option, which I understand fully. You could always add a keyboard to it to help enhance the sound.
But I think I know what the main problem is. the bass, or lack thereof. I really don't hear any bass at all in this song. Which is a big issue. If nothing else you could get Fruity Loops and add a bassline with that program if you can't play bass. But being able to play guitar, I'm guessing that isn't an issue. But if it is, you should think about adding a bass part with Fruity Loops.
Fruity Loops' electric guitar sounds blow, but the basses in their Slayer section aren't half bad. Especially when mixed right in a song. Just something to contemplate anyways.
Overall I like this a lot! 5/5 and 9/10 for originality. I would normally only give you a 4/5 on it, but I'm guessing like most entries you got zero bombed at least a dozen times. So this should help balance that out ever so slightly! :-D
Nice work, and let me know when you post more stuff if you want.
-Gravey-