hmmm.....
For some strange reason this reminded me of an old N64 game... can't remember what it was called. I really liked the feel of it, up until the beat came in. It wasn't that it ruined the ambient feel, it's just that there's too much kick. Use it a little less, sometimes it's the silence after the sound that has meaning, not the sound itself. And turn it down just a bit as well, to let the other percussion bits come through a bit more, and it would be golden. All in all, good ambient piece. good work.