Fun, though a little slow for my taste.
Couple notes, You might consider adjusting the player controller. I understand you don't want diagonal walking, but pressing for example UP and RIGHT, shouldn't make you not move at all.
Also, i learned the hard way that escaping momentarily to another room is a death sentence. Since the monsters can't come through the doors, they just wait, and you die instantly upon trying to re-enter the room.
Good start!