Oh man this is awesome.
Just the way things fit together between the riffs and the drum just as an example. The variations in riffs are all great, very melodic and moving, and the song has a flow to it that works really well.
It's refreshing to hear someone actually making something melodic, and not just lame bass drop effects-laden crap, or the same old thrashy 'n' deathy stuff that everyone seems to put on here (what i did discover until now!)