It's pretty good! I'd personally like more clarity on what mining the ores did because as far as I could tell, they didn't do anything except take more hits to break. Also for the Multiplier, a bar showing how much you've build up to the next multiplier would also be nice, or just have a tooltip for the multiplier tell you how it works (because Im still not certain how it works lol).
The art is lovely, the scroll up and down to view more of the cave is neat, the screenshake adds a great feeling of weight to your actions.