The art and the atmosphere is pretty good for me although not very detail but it really give forlorn feeling which is matching with the story. The main downside for me is it is unknown why the cleaners agree to kill those people without even told yet that they are going to be killed if they don't. It's like hey i can control people now and i'm told to kill certain people then let's do it. They aren't even cruel or psychotic people to begin with, even azure know the consequence of disobeying by experience, not because someone told her.