It seems Original Soundtracks are taking so long to come out, it sucks but I can wait as long as they finally come out. lol
I really enjoyed this Soundtrack when I watched the anime, there isn't too many action songs but its more of a bone chilling, dark, emotional soundtrack the few actiony songs are really good though in my opinion. :3 I know as it was airing quite a few people were really into the soundtrack as much as me so I am really surprised it hasn't been uploaded yet. I wish there were some samples to show but its a Blueray/dvd exclusive OST. I suggest if your really interested go through episodes 2,3,8,9 and 12 I believe those episodes had some of my favorites playing throughout.
Oh there is a cover of a song and it sounds almost exactly like a song used in the anime I'll link that.
https://www.youtube.com/watch?v=9CUkop-5qr4