Spieler’s intentions, his “New York Ninja” often feels like a pandering homage to other movies of the period, particularly Cannon’s cycle of chop-socky ninja pics, like “Enter the Ninja” and “Ninja III: The Domination,” as well as Troma’s gross-out superhero comedies “The Toxic Avenger” and “Sgt. Kabukiman N.Y.P.D.” Voyag3r’s distracting new synth-heavy score never lets us forget that we’re watching an homage and not an authentically corny throwback.