I had to figure out where this song was...
Played MGS a long while back, but when I heard this, I didn't know what part it was heard from. Seems like it's when you're outside with the wind gusts, but no, I was wrong. Malevolent and eerie of the boss rooms, the gusts and strings makes things feel full of despair, desolation, hopelessness. While the only argument is that this is a song that has very little room to remix without losing the feel totally, I really like where you took it. Might be an artifact at 2:39-:40 where the instrument seems to 'break' there. Still, deserves 10/5, nicely done.