Cool concept! But I had a hard time understanding when and where the yo-yo would go(-go). I'm not the best at platformers, so I'll count a lot of this as my own skill issues, but whenever I did get it to latch somewhere I wanted, it was nice to see it fly around. Also nice job on the sound design - simple, but effective.
If you continue tinkering with it, it would be neat to have an "aiming" option before you launch the yo-yo to see where you'll go(-go). I think that would have helped me to make progress once I got to the harder levels instead of just trying to rely on luck to dodge the spiky red lava walls and floors.
A nice entry though!