That music has more than a touch of Thomas Newman (Shawshank Redemption) This fucking thing is quite possibly going to tear my heart out....if I ever get to play it.
It is amazing how fairly homogeneous the settings are, yet the subtle differences as you progress is what keeps it interesting. Along with the adorableness, intrigue, and the edge-of-seat moments :p.
Edit: Finished the playthrough. Seems like a good game.