I would definitely work on variation. It's pretty basic as far as direction. At :25 I felt cheated when I heard the little variation tease that you didn't follow up on.

Sounds cool, but I'm not really a huge fan of Garage band as I can never know if this was just put together using the loops GB gives your or if it really was made from scratch, I'll still review it like it's made from scratch though.
I think it's a cool track, but it doesn't really sound like a full song at all. Add some percussion, some bass, different melody layers etc. to really give the listener a full music experience. As it is now it only sounds like a single midi loop really.

{Review Request club}