Interesting...
It really does have an ambient feel to it. Although, I'm not really fond of the overall sound in the intro, it sounds very nice when everything else picks up.
I LOVE the piano. So simple, yet so elegant. Being a pianist myself, I am more than slightly biased to the piano in almost all songs. :-)
I like the mix of instruments and effects you have going on. Very nifty touch indeed. I think you should lean a little more on the instrument side, rather than the effects side personally. But that is just me.
I really like the reverb on the drums. Typically I am all about punchy drums, and hate reverb of any sort on them. But it really fits this tune well to have reverb on them.
I think you should have a bass of some sort in the mix. I really didn't hear any. So maybe add something with a very soft attack. And give it a nice rich fat sound. Not punchy at all, but rather thick and smooth. I think it would really add a new dimension to this song.
4/5 and 8/10 overall. A good song, but not quite great yet. :-)
Best of luck on future projects bud!
-Gravey-