I liked your art in the gallery, really nicely done, sets a proper mood for the game right from the start. Transition was cool too.
First I didn't notice that you get 'hit' by these flying things if you try to occupy their space, and I died. Then I figured that instant movement in this case will make it easier and switched to the instant movement system instead. Using items by clicking on them wasn't particularly obvious, but I figured it out in a couple of minutes, so it's not really a big problem. Then again using the key on the door was done by moving into the door, but I was expecting to either click on the key at the top of the screen or either click the door.
Audio will benifit this game a lot and longer version with progression of difficulty as well as audio-visual feedback of being hit of course.