Cool story concept, nice graphics and music. :) The pickax enemy is hilarious, but maybe it shouldn't be positioned literally next to the player at the start of the level lol :)
The connection to the theme is not so strong though, since it does not tie into the game mechanics as far as I can tell. It would be nice if the rock could actually attach to some walls to "climb" or something. Anyways, I wasn't sure if I was able to achieve the goal of the game - I just got to the point that says "yeah, you rock" but I wasn't sure if that was the end or not. (I couldn't find any other places to progress though).
Overall it's a nice effort and I enjoyed it.