I really liked the ideia and the setting, congratulations! If you intend to work on the project after the jam, here are some things I noticed and would be nice to be improved:
I lost the game once and tried to play it again, but the murderer was already there from the beginning. My guess is that you probably forgot to reset a boolean!
Because of the problem above I had to refresh the page every time I wanted to try again, and I had to replay it a couple times in order to win the game. I accidentally hit capslock while running from the murderer, and and the inputs stop working... Maybe it's case-sensitive, but that is the first time I see this kind of problem.
Also, I think you could develop the thrill a little bit more before de assassin appears, that would make it more fun (at least for me).
Congratulations again!