When I first opened the game, heard this music play and analyzed the main menu, I immediately knew that the whole game would have a sad atmosphere. It's impressive how so much can be demonstrated in such a short period of time.
I get this very bizarre feeling when I listen to this. Don't get me wrong -- I enjoy it a lot, but I don't feel relaxed at all when I do. In contrast, I begin to feel anxious. My heart rate picks up slightly and it gets harder to breathe, as if the oxygen level in the atmosphere around me is slowly dwindling. No clue why.
Music has all sorts of weird feelings. On the other hand, this OST makes me feel nostalgic about the relationship I was once in. It's an interesting feeling for sure.