Amazing demo, like everyone else here is saying - immaculate vibes, music, artstyle, etc.
With Noire, the knife-focussed build can feel a little OP (hidden dagger & sharp buffs, and/or rosary knife with cigarettes to boost flee chance and get the damage up), but that's a minor quibble and I can see the dev responding to other comments saying there's a balance update in the pipeline.
Overall, I would have rated this highly even if this was the full game - the fact it's just a demo makes me very excited for whatever is coming next. Congrats to the dev(s)!