Even more improved
Obstacle wise it is better. Seems a little easier to control too. Simple, but more complex than the other version (shurikens were nice). Maybe on the different levels with different themes you can have something different than a shuriken as a deadly object, like ice spikes on an ice stage, lava shooters on a lava stage, maybe even add some falling bolders to the jungle stage. They don't have to do insta-death things, just take a certain amount of health.
Maybe you can add some music to a pause menu if it makes it in the final (or maybe just have the stage music continue while paused). Possibly you could add MINI GAMES!!!! Just something to do besides the game if you feel like it. You could also have a few puzzle-oriented things that you need to do to progress. These are just a couple of ideas and just some food for thought. All in all, so far, so good.