The game looks really promising! I explored quite a bit and still had time to spare. The only thing I find a bit off is the running (for me personally), but that's a small kink and really not a big deal. Although with one zombie, I kid you not, it took 8 headshots to put that sucker down. Having the knife helps a lot though when you finally get them down.
Overall the atmosphere feels really nice, loved roaming the dark hallways and having no idea what's going to happen next. Loved it! Can't wait.