Nice tutorial! It introduces the player very slowly by making them simply walk around, which is good.
At first, I wasn't very entertained by the gameplay, but after you get into the shop loop, it's better. The shop seemed fairly well optimized too.
I don't love the concept of the purely random nature of finding the mines; if you could somehow make the player think while they're choosing holes to dig, that would be awesome. Maybe add some variable terrain or things as well?
The graphics were a bit unenticing, but I'm sure you could improve on them if you wanted to.
Good job overall! Nice atmosphere and sfx.