Just a quick review here as I have to admit that I gave up on "Killer Is Dead" after a couple of sessions.
I do like Suda 51's work. I played "No More Heroes" to completion and the first couple of levels of "Killer is Dead" promised the usual mix of fun gameplay and nonsense plot. But what killed the game for me was the button mashing required to revive the character and defeat an early Boss (David on the Moon). I just couldn't successfully complete any of them. Not sure if it was something to do with playing the game on an Xbox One via the backwards compatibility process (online searches talked about framerate being a problem with doing this on PC, but nothing about any specific issue with my set up) but it was the end of the game for me.
At my age, with the limited amount of time that my family, job and life let me have for gaming - I'm afraid that any time spent where I don't progress on a game is time that I can't afford. So I stopped. I enjoyed what I saw, but that's barely enough to form a full opinion.