A very neat proof-of-concept for sure! I'm very impressed with the art and some of the programming here, that one ghost that comes out of a room you can't look into in time got me pretty good.
If I had to suggest some details before the deadline: Maybe adding a very brief blurb of why the main character works the way she does would be interesting, and perhaps some quiet sound effects for the gun itself. As is, it is only a purple line and looks a tad comical compared to the rest of the game that is very stylized.