This was really effective and atmospheric and I spent quite some time on it! The sound is minimalistic but made me jump a lot, and the visual atmosphere is a good mix of creepy and cute. I was quite freaked out when you see yourself in the corridor :p. I could see this being developped a bit more, would play again if so!
I wonder if there is another puzzle with the red clock and the room full of giant books, outside of the building ? I didn't manage to get it !
NOTE: You may want to state in the description that the game cuts off the dialogues in the web version, because I was confused for a long while playing on it! I downloaded it when I figured the dialogue was missing and the atmosphere alone was interesting enough to make me want to stick around :)