Very addictive and good potential!
Here's some comments and improvements:
- the ui was very buggy and sometimes some panels just remained open for no reason and I had to do tricks to close them
- I would have added a soundtrack, something simple too would make a good difference.
- the sfx for the mining were ok, but the quality was very low and they can become annoying because they are repetitive.
- I didn't see the connection with the theme.
Overall a good fun game :)