Nice.
The intro is quite awesome, it's startling, not much I would suggest in changing there. But if you notice, when the drums come in at :12 seconds, the background has a slight bass, it sounds like an organ, which is very atmospheric, I would recommend elaborating on it's warmth.
Let's detail those wicked drums, get down and dirty with those symbols, I can tell you tried to create variation, but because there are so many symbols, you might want to deconstruct the percussional symbols and leave the snare, the bass, and maybe a few slams. You can also jump up the bass on those bass beats, but don't use them liberally though, that's what'd suck the life out of the drums.
Nice FX, it just doesn't seem to last much, try putting in more spacing, like putting a few echoed snaps, then stop the drums and let the melodies introduce themselves, then bring the drums full on.
That's all I can come up with.