I admire simplicity, but this is a little sparse. It could do with a hi-hat and some background noise. It also doesn't progress very much; it ends pretty much the way it starts.
However, it does sound like you have a knack for putting a beat with a melody. Even though I nit-picked at it, I can't deny that it made my head bop a little. It's a very chill-out combination of sounds. I just wish there was a little bit more to it.