This was fun and hilarious at the same time. :D I loved those moments when I was able to string together a number of well-timed pushes to rocket the rock up the hill, but equally enjoyed the times when I over-jumped the rock and wanted it tumble into oblivion.
I know this is a wonky-controls/physics type of game, but it probably could benefit from some tightened jump mechanics, where you can jump high holding space down or jump slightly to reposition yourself, especially when trying to get through some of the timing/positioning-specific parts of the hill. Also, I was on a roll (no pun intended) getting the rock up the hill, then somehow my body instantly went to the top of the background object and my head got stuck there. I was so sad, because that was my best run yet! :D