Somehow I couldn't progress through the game. I read the hint in the game page and tried multiple times but I still couldn't figure it out. I also fell out of the map near the door in the foggy basement, which btw is too much fog. You'll also notice if you move near the wall, the fog will disappear. Other things I noticed are the mouse cursor being gone in the main menu after triggering game over.
It's a nice concept, and the hiding mechanic does give the game legit tension, but definitely needs more development time.