Holy! This could probably turn into a real commercial game. Not a platformer guy, but I can see the appeal. Personally, each time I used the yoyo I always felt like I needed to go further but I only went a small amount. Also some platformers start their game by quickly showing the entire level, it's a bit hard to gauge, even after one walkthrough, where the better routes are. Maybe that's the intended design.
Also the visuals is an easy 5/5, parallax city, that stuff is PEAK.