Maze rooms are extremely difficult now. The tight passageways get filled with walls of water and lightning from the many trash mobs that spawn. Even playing two levels below me, It seemed too tough and what with the new health system, you can't get back the huge amount of health you lose.
This might be my own lack of skill, but It did seem a little too difficult in these particular rooms. I can't possibly imagine trying to survive one of these on a higher level.