Cool game and cool visuals, a bit simplistic maybe, but they do their job. The idea is also well implemented as a core mechanic of the game. I see you had may idea about how to use the yoyo in different situations. As my feedback goes, I'd make the yoyo be able to hit multiple enemies at once, and I'd add some kind of background music. I'm also very unsure about the ending: does the game finish after that big confrontation with those enemies or is there something else i didn't notice?