great
was very simple, and very original.
great graphics, ans superb gameplay. please make the tutorials 8-)
as for the slo-mo: it's the one thing (besides storyline) that made this game worth it, so keeeep it! could be improved though: maybe some way of really dodging the shuriken; and disable it when the vertical distance is big (i.e. when you are on the ground and the projectile high up, for instance).
and also, make it longer, cause the game was really short