Neat game, the ambience of it was nice. I noticed two bugs, one is an easy fix. The guy you buy/sell to, you can open more than one widget if you right click more than once, which double draws the window and then you can never close the shop. Just do an if check to stop you from opening it more than once. The other bug was I couldn't mine the objects. The played just never collected any of it. Congrats on the submission.
Viewing post in Mineshaft jam comments
I was thinking about the not able to mine bug, and I am not totally sure what may have happened, but it is possible that your active hand was the sword and not the pickaxe - then you cannot mine. You would need to scroll or use E or Q to change the active hand to the pickaxe(which doesn't do as much damage to monsters) Could you check this and let me know if you still can't mine?