You should definately add on to more of this, it's frigging sexy so far, and I like where it sounds like it's going.
If I would change one thing, it would be that just before the key change you need some more buildup. It kinda just sounds abrupt to me, and I wasn't really expecting it. Unless that's what you were going for. In which case, good job! (lol)
Also, you should put like... a lead solo kinda thing. That would be incredible. I'd probably pay for that shit. That'd make my day.
Thank you for your input very much!
Please contact me if you would like to use this in a project. We can discuss the details.