Fun and relaxing game with a satisfying upgrade mechanic, I like it! Reminded me a bit of Steam World Dig which is one of my favourite games. :D
I think some extra feedback when breaking blocks would have been very nice, especially some indication how close you are to breaking it. I also locked myself out of the first shopkeeper on my first try as I broke the blocks underneath him. On my second run I made it all the way to the bottom tough!