This is pretty great! It's pretty varied, and has a fair degree of challenge! But I think it could do with some bosses beyond the last, (like maybe one every 10-15 levels?) just to spice it up, and it really needs more upgrades. I had maxed out everything by the second world, and it would be amazing to have more upgrades, and maybe even increased shuriken damage or new moves. Oh, and if the sequel ever comes out, a port would be amazing. Indie 2d platformers are pretty big right now.