I definately like what I hear, carlH. I think something that might be fun, and could add to the overall mood of the sound, is to toy around with your tempo some.... speed it up a little in some sections, and slow it down a little in others.
It also sounds like there is elbow room for something to add a little more space to the sound (not that it needs it - sometimes minimalist is the way to go, of course) but some spacey-pad (maybe low-end, and rhythmic) would fit in nicely if you as me.
Keep up the great work!
-Shaz