I've always liked this art-style.
I don't know the technical term for this particular art style but it's becoming ever more popular in the animation world these days.
Because of one of the characters, I'm assuming there's gonna be some funny jewish jokes here and there. As well as some 'inner-monolugue" being typical from noir-ish detective films?
It seems that Stamper is quite the versatile voice actor.
The musical score is beautiful.