I really liked the unsettling atmosphere and the "security camera" type graphics. I was always wondering who was going to come in the door next!
I think if you were to expand on the game, I wanted to move throughout the hotel, like when the guests phoned for something I wanted to go and actually physically do it, maybe it could be a bit of a puzzle like trying to figure out where to get whatever item they wanted, and when you gave it to them you could see a bit of whatever was happening in their room. Or maybe you go to deliver it and the person is missing or something.
But it definitely captured the horror/eldritch atmosphere even in just one room, great job!