Nice game. Works well and has good graphics (love the gargoyles), though the player needs a jumping animation (and a way to drop from the ladders). Found killing the skeletons very satisfying, maybe it's a bit weird that you shoot with mouse when you can't aim to any direction.
I thought I had the mask from the start when it showed up in the inventory but that wasn't the case. Don't know if I also missed some secrets but I only found one key and there were three chests.
The starting door after death was always the same door in the area so the best way to backtrack was to kill yourself lol.