Took a little bit for me to get the movement system (I got through the first level by using the YoYo as a pogo stick, not sure if I was meant to do that!) but the opening bit of level 2 with the blocks used to hang from the ceiling made it click. Maybe having a bit more of that in level one to show off the mechanic a more would help.
It was only at the end I realized the push and pull mechanics, during the credits, so possibly a segment in level one where you explicitly use that mechanic to climb to show it off and teach the player would be good. Once you know what your doing it’s a great mechanic to play with, so a tutorial to help make sense of it faster would be great. Anyway, apart from a few nitpicks, a good sold platformer and a great first game!