Really fun game!
Perhaps felt a little long, and could have done without redoing the game backwards.
I really liked the yoyo/grappling hook mechanics, it felt very satisfying. Flying around the levels became second nature fairly quickly (for the most part). The Golden Yoyo acts the same as the base yoyo, which could have been a nice "reward" on the backwards redo if the Golden Yoyo had some interesting new mechanic or something additional/better than the base yoyo.
Nice visuals and music.
Great job!