Katana Zero is much more than it first appears. And it first appears to be plenty. A side-scrolling reflexy beat ’em up, painted in very pretty pixels, with a character who cannot take a hit. It’s a surprisingly interesting weakness to give your ninja-esque mass murderer, who is fast-paced, all dashes and slides, rolls and manic combat. And yet on top of that there’s the temporal meddling, some peculiarly introspective downtime, a novel and fascinating conversation system, and the fact that your incredibly vulnerable character is in fact, um, immortal.