You did it twice
While i've got nothing to say against the low-pitched one, i have to admit that the high-pitched ringing sound feels a bit out of line in the intro, while it gains its full potentials as soon as the other instruments kicks in, but i have to say that it's a little too persistent, maybe it's just a matter of volume, but I would have liked it more if that was used more sparingly...
That aside, a really mind-blowing experience! Maybe it's just me being a little high, but while I was listening it for the first time I was brought to another dimension, where an alien court slowly examined me and judged my death penalty, ready to bring me outside the atmosphere naked to let my guts be exposed by zero pressure. Then, luckily, the song started fading away, and I re-opened my eyes in time... Otherwise I wouldn't be here writing these words.
Anyway, the one at the beginning was the only complaint I had to make, I can hear only awesomeness over here! Keep up the good work!