O.k. I have played them and they all sound good but here is my list:
1.Strange to stranger
2.Fields of light
3.Time
4.Beside you
5.Leaf on the breeze
6.Vortex of Illusions
7.Concrete sky
8.On the line
9.Is it me
My favorites are definitely the first two samples since they seems to carry their own atmosphere and could be emotionally recognizable even outside the game.
As for categorization I would say that 1to3 could be level ambient tracks, 4to6 are more suited for menus or credits, 7 & 8 sounds like the boss battle music and 9... sounds like something for the club & drinks in Munich when the game is done