This is a really cool idea and I could easily see it being a bigger, commercial game with some more work. The gameplay, aesthetics and sound are all really simple, but that's not a bad thing. They all work well together and make a game that feels unique and fun to play.
My biggest problem with the game is the controls. They're just too floaty. Your character falls and moves too fast and it feels far too light. I was probably fighting my character's movement more than the falling rocks haha.
Other than that, a really solid entry. Nice work on this! :)