Cool game! One of the first I've played in this jam that didn't require mashing buttons to win. The sound and gameplay was good (maybe some background could have been nice). The only thing I would say (which might be a browser bug or you ran out of time) is that there was no visible effect when right clicking to attack the ghosts. Another minor one was that the last level was a bit long, too many places to check for the key.
Great game overall!