Nice...
...but not exactly great either. ;-)
I like this a lot. The melody line is dark and beautiful, and has a mystical quality to it. I think the atmosphere you created really enhances this quality, especially the reverb you used. Very tasteful reverb.
The piano is very well written, and has a very bouncy sort of light to it. Even though this song as a whole is very rich in dark texture, it keeps an air of innocence. That is not an easy thing to do, so I commend you on that.
I have two issues with this song though:
1. Length. Jesus this is to short. Lengthen this my friend, because it could be so much more if you added another chorus bridge along the way. As it is it is simply to short.
2. Where is the percussion? You need some epic concert bass drums and crashes going on in this song. It would greatly enhance this piece. Right now, there is simply a lack of any real quality percussion. And that is not a good thing at all my friend.
4/5 and 8/10 overall. This has great potential, and is very nice as it is. But it has the possibility of being something great if you just put a little more work into it.
Hope this helps somehow.
-Gravey-