This is super fun! There's something magical about flying around the screen and taking out all of the ninjas, and the creative spins on the mechanic in each level are genius. One thing that could be improved is the platforming -- it makes the player a little harder to control without adding much to the game, and sometimes the platforms got in the way of chaining yourself across the screen, so limiting or even removing that component would allow for the game to be even smoother and more fun. And of course there are the tiny things that need polishing, but that's to be expected in just 48 hours. Awesome work!