Hmmm when I tried the demo before I couldn't double tap so I can't run or crawl, I thought it was just a demo thing but turns out the same for the full game so I never got past the part where I have to crawl and never saw a single monster. What's odd is that no one else seem to have this problem heh, looked it up and there's some interesting topic with Unity on this one but nothing like the selective case just for me.
At least it sounds like I'm not missing out on much.
I'm having double tapping trouble too. Glad to know I'm not the only one with that problem.