I like were you are going with this, having enemy's to kill and have some paths blocked when fighting them. I think it would be better if you block all exits to make it more challenging.
The art style is nice, the only thing I would change is have the walls/ pillars tone slightly darker as it was unclear tome were I could/ couldn't go.
I did find a bug were I could walk on some book cases and then walk of the map and fall to oblivion.
Overall I like were this game is going keep it up.