Very Cool...
The percussion is really good, as expected from you. That is always the first thing that comes to mind when listening to your song. Glad ot say this is up to par with what I've heard from you in the past.
I like that lead synth, but I'm not sure it could hold its own throughout a whole song. I would make sure not to lean on it too much. It has a sweet candy effect to my ears. What I mean by that is it was great the first 5 times I looped this little demo, then got really annoying. So I'm not it has a lot of staying power as a lead synth throughout a whole song. Just something to think about.
I like the choir sample you have. Its pretty nifty sounding, albeit not really groundbreaking either. Just fits nicely as it is, and nothing more is really needed than that. :-P
It lacks a little on the low end in terms of sound. Maybe a low pad would fit in here to give it some bass and body. But besides that I think the mix and mesh of synths/percs/instruments is really well done.
4/5 and 7/10 overall. (It is just a demo after all :-P) Can't wait to hear the final product. :-D
-Gravey-