Very Haunting.
This song is very emotional, it really almost made me want to cry.
It has a soft melody about it that makes it really easy to listen too. I really don't think its long enough to give it justice, although, from your comments you lead me to suspect something happening to you.. I understand that you're one of those who really uses emotions to get the idea of what you're trying to convey across, so I do hope that whatever inspired you to do this will soon give rise to feelings that give you a more hopeful outlook on life.
The hauntingness of the piano makes it quite mysterious in my mind, but i think you need something windy, (wind instrument) to help along the hauntinness of this piece. Perhaps giving it an extra melody that might make it longer, but still beautiful. If you could, I'd recomend a wood/reed flute... a metal flute would make it sound too bright and well... almost artificial.
Otherwise, excelent work, and I look forward to whatever you write next.