“Boy Kills World” (** out of four) was a florid but feverish pulp-revenge thriller about a mute boy named Boy (Bill Skarsgard) whose family is murdered and is trained by a mysterious shaman (Yayan Ruhian) to be an instrument of death and seek violent revenge against the woman (Michelle Dockery) and underworld mob who killed them. Generally watchable for a while but starts to go overboard into excess and violent ugliness and wears out; shows the unmistakable influence and stamp of “The Matrix” and “John Wick” series.