I'm having an issue with the version Alpha 0.0.82 whereafter entering the mine my level up page "P" doesn't display properly.
It's a shame because it's game breaking I can't level up.
The only fix I found to this is a new game, I'd reset my graphics settings to the default just before taking the screenshot.
What I did in the mine was bring a box in and fill it with copper ore and then take it out, load the cart, and head back home.
A temporary fix I found is to crouch down and use the "P" menu which will display it (albeit awkwardly) in your hand and you can see every option for level ups.
