Ok so.. I died so much that I found out you can just bypass every enemy including the boss by running.. guess I'm a speedrunner now :D
I'm not good with this type of game but I like the addition of the moving "wall" or whatever it was, so that you can't go back and take your time. For the other issue, I think maybe just have a trigger, if enemies are still alive, the fireplace is unlit or something and won't teleport you.
Still, pretty cool, liked the lighting a lot. An reloading was a strategic component I didn't expect to be so important :D