Nice concept. The atmosphere is great, you always feel followed. I guess you took a lot of inspiration from alien? Hope you can expand on the idea a little bit longer to make it a full game, like using vents to escape from threats, making loud noises is a nogo and such things.
I also think its nice to put in clues on the story, makes it worth while to explore, atm its a little bit tedious due to everything looking the same. But overall great job