I played until the screen went dark because it became very difficult to see the game anymore, is that a day/night cycle? I like the idea of a ninja action platformer where you fight with projectiles a la Shinobi/Ghosts n Goblins but I don't understand why enemies need to take so many hits to die. When they run away from me I'm not really being challenged any more by their tanky-ness.
Not sure what the purpose of shuriken only being airborne is if there is no grounded attack on that button since the airborne horizontal movement is the same I'd understand it if I could throw in more directions when airborne but as it is there's no risk/reward to not jump so I might as well be automatically jumping when I press attack. I put 5 points into Agility hoping to get a better jump/movement speed and couldn't tell the difference.