Very creative use of the theme and great gameplay to boot! I played the browser prototype before realizing the windows version had more levels (and polish). Great base mechanics and challenging levels. I love puzzle platformers and this one required a nice balance of planning ahead and platforming skill.
My few critiques is that the hit box for the player isn't obvious from the start. There were a lot of jumps where I thought I was vertical enough but not quite to make it onto the platform. Also the hit detection on the pickaxe when destroying nodes is a bit unclear. It seems like you have to be on top of the node when you start the action. Otherwise, fantastic entry!