I use a Toneport UX1 myself, and i know, its not NEARLY as cool as a UX2, but it gets the job done. j/k And i believe its octave that you were looking for when describing the melody.
Anyways, i pretty much agree with Epitaph on this one. The drum is a nice thrash beat but doesn't stand out at all. I think by adjusting the EQ by bringing up the lows and the highs a tad might help a little at first. It also seems there's no hi-hats in some places mostly during the solo parts and i'm not sure if that's on purpose. Its kinda hard to tell, but i don't think the guitars are panned at all. I can hear the cymbals to the sides, but no the guitars. You need to have 2 tracks and pan one hard right and one hard left to really give it a more stereo sound and that'll also make the leads stand out really nicely. For the leads, the playing is spot on but the leads need more effects. They don't need much, but definitely some slight chorus and reverb and a nice delay effect too.
Eventually a bass line would be nice too, but that's something i would worry about later. Its funny how much of a difference a bass line can really bring a track together once everything is done. Apparently bassists are important!! lol
So i think messing around with all that first would be a huge step. The drums would be the first thing cause they seem way too weak for the genre of song your going for. And definintely pan those guitars! Take a listen to my Legend Of Zelda dungeon remix, its right up your alley and might give you a couple ideas/pointers.
<a href="http://tindeck.com/listen/gzjy" target="_blank">Click here to download <b>NintenJoe 64 - Dungeon Of Despair (LOZ NES Dungeon).mp3</b></a>