I think this might be my favorite protoype ever played, simply because you know how to handle atmosphere and "something never before seen" so incredibly well. :)
The gun mechanic is INCREDIBLY immersive, although a bit nauseating after a while. A few tweaks to the gun movement, and I can tell I wouldn't get motion sick in the same way.
I played both Wrong Floor and From the Darkness, and now this one...
I LOVED Wrong Floor because it stayed close to "realism horror", which felt much more relatable. :) "What if you were trapped in the basement with a maniac". Really cool short game!
I immediately bought From the Darkness on Steam, when I realized Wrong Floor had been taken further into a full game. I was a bit disappointed though... :/ Still a great game, but MUCH more supernatural than Wrong Floor, which broke the immersion quite a bit. Had hoped for "realism horror" again.
My point here is to say that I love the concepts that you are throwing out. They are absolutely unique, creative, and MILES above other horror titles out there. I just really hope they stay on the more "relatable realism" side of things, since I wholeheartedly believe that makes for a more terrifying experience. :)