This is an incredibly clever and well-executed take on the theme that's also a blast to play! I absolutely love the "role reversal" of a typical city building game - such a fun idea :)
I have two extremely minor nitpicks - one, stocking up on miners early feels pretty overpowered, and two, the placement of the "closed" UI icon was a little confusing to me as I initially thought those buildings were already closed.
But all in all, this is such an awesome take on the jam's theme. Well done!