I gotta tell you, I was like 10 minutes trying to figure out what to do. It wasn't intuitive to me that I had to sell the first piece I found on the chest, I discarded it because I didn't know there was a difference between pressing I next to the shop and pressing I far from the shop and I didn't know how to get rid of the floor since it looked like you would be able to mine through there (I thought that was what the game was about).
But after I figured out how it worked it was so satisfying mining, I wish I could jump higher since when you mine a lot and you increase the radius you can't go back up and the fun part was mining like crazy. That was a good entry to the jam, good job!