As I thought about it. Maybe some popping numbers for the gained ore and maybe stamina loss would help. And some fading vision with a warning for to low stamina.
But I plan to add visual pickaxes, saving and maybe some type of railsystem (to place shopstations deeper in the mine or fast travel) so you do not need to manually go back again, if you are super deep inside the astroid. And a map to be bought at the shop, that adds a minimap. I think with this it will be a well rounded small game.