This oddly reminds me of more existential, cosmic horror; as I learned more and more about the situation, I started to dread the end of that countdown more and more. You did a great job making me really want to examine everything in the room and making me pay close attention to details as I started to make connections. The whole narrative largely comes together in one's head, and I think that's really cool.
The timer is a super cool feature that also pushed this sense of dread and anxiety... but I have to be honest and say that the constant ticking was very distracting. It's good as a reminder that I am on a time limit, though. Of course, the timer is also a really interesting application of the theme!
Good work. This one's an easy favorite for me.