Interesting piece. One thing i will say is that when the velocity increases you should turn up the volume of the element. This will increase the realism you are going for. While I like the reverb you got, I think it is a bit to wet, may want to pull that back 20 % or so. I liked the composition though, and I think it has commercial value. Tweak it a bit.
Nice arrangement and instrumentation!! A mellow, relaxing piece with an assumed positive message.
Very beautiful. Could be in a move soundtrack.