Played together with my friends. Zombies are fine, but as a player you can ignore them. Found one key and then my friends started to leave because we did not know how to solve other puzzles. It is nice beta proof of concept. I wish you good luck with the development. Maybe some more instructions and leading player through the story would be much of help. Game runs very smoothly, graphic is quite nice, played on gtx 1060 without any issues or stuttering. Good job anyway.