The art was nice, but repetitive. The gameplay was fun to start with, but became tedious after a while of continuously doing the same things. I'm assuming the monsters on the lower levels were only there to try and scare people, because I would charge at them in an attempt to break their legs and nothing came of it. If you make another I would suggest setting the maze up in a way that you are required to go into the deeper 'scarier' parts in order to win. Also I'd suggest making monsters appear more frequently, and make them actually pose a threat in order to make them more scary. Also it'd be nice if the scenery changed more dramatically as you progressed, and with new scenery came new hidden passageways, traps, and monsters.
As a side note, I may have just been missing a mechanic which I should have figured out, but the keys don't seem very intuitive to me. I can never tell whether I used a key on a door or not, and some doors wont even open when I know I have a key.