Solid game, I liked it! There was a weird quirk with the controls which made them behave in a way I don't think is expected. If I was holding right, then pressed up, I would change directions from right to up. If I was holding up, then pressed right, I would continue holding right. I would personally prefer changing direction to the newly pressed direction, but more importantly this should be consistent. Also, the way the sword sprite was positioned, and by extension its hitbox, felt awkward to me. It only covered a portion of the area in front of the ninja, so sometimes it would miss the things I was aiming for when I turned.