Excellent! It does ring the bell for me. In one of the versions that I dismissed, I made monsters a bit more practical, e.g. if you jump on a ghost, you can reach a ladder and climb to the next room. Also, bats in this context are pretty useless except for a visual flashlight effect (and killing a player, oh). I will sleep a night on this, but I agree that it would be fun to solve some real puzzles.
Music is on the way, I just ported a little classic masterpiece: