I'm really sorry for not reviewing your song sooner, Marcos!! :o :o *SORRY*.
And I mean that, because it's a pretty damn good song. I for one could hear the vocals just fine, and the lyrics are very good. The song has a nice bounce to it, and I like the way that your lead guitar parts glide over the beat. My only bugbear is with the vocalist - he's singing in the right register and hitting the right notes, but he needs to work on his vocal texture a bit, soften some of the edges and give those parts in the verses a smoother feel. He still managed to convey the spirit of the lyrics quite well, though. As for the guitars, nice arpeggiated progression ideas, and there were some really cool lead licks. Perhaps you could use an effect of some kind for the last big solo, to give it even more impact.
Don't know whether that helps at all... once again I apologise for being so late in giving you a review, I'm so sorry.