A little bit from here, a little bit from there - one look at that mask and I wanted to go watch Darker Than Black, one looks at the gunplay and I wanted to go watch Kite, or Madlax, or Noir or Gunslinger Girl... Actually, a lot of this made me want to watch Noir, but that's beside the point. There's even a very slightly modified rendition of Don Davis/Juno Reactor's "Burly Brawl" playing during the scene starting at 18:00. I'm not seeing a lot here to recommend this over anything else, but at least it uses what it borrows from elsewhere *somewhat* skillfully.