Not sure what genre to call this, but tap any enemy with a level equal to or lower than your own, and it explodes, causing you to level up.  You use this to reach more and more areas, and to say much more than that would be saying too much.  I really love the visuals, and the world that's been created here!  The sound effects are goofy, but that perfectly fits the tone of the writing.  Definitely worth checking out!