Love the mood
The piano and harp (or at least thats what it sounds like from my perspective) were two really good choices for a song like this. The fact there so distinct from the rest of the song just makes it much more dramatic. If this were used in a movie or game I could see the protagonist wondering the ruins of a destroyed city, probably his/her hometown, everything and everyone that was part of their past... is gone, or destroyed... and all they have left is what remains of their current life.
Why I think it would be like that is because even though the song is very emotional, it also has a feel of aimless thought, even though I don't know how to describe it, thats what comes to my head.
Awesome job, I hope you and your buddies can come up with even more epic songs.