Had some good scares on this one! Those mannequin enemies did the trick very well. I also enjoyed the "customize your difficulty" take as well.
It fit the theme very nicely; However would have preferred to have more gameplay feedback on the attack as I never quite knew when the attack was in fact working or not.
I will also advise planning ahead on the procedural element of the key placement; as on my very first try, I was VERY LUCKY that it spawned just 5 seconds away and the door was near.
Had to make another playthrough to properly experience the game.
Well done!