This film is VERY nior-ish. It's cool. I've always loved those type of movies. Examples are Dark City (****) and M (****).
You say that you HAVE to pay attention the entire movie or you'll miss something. That is totally true. That's part of the reason I had to watch it multiple times. It's so interesting to watch for some reason.
Correction for Brock: It's in 2019 (wow, who cares, really? [img]/ubb/smile.gif[/img])