The game idea is nice, but I feel like the mining mechanic wasn't used enough. The controls were also weirdly unresponsive, when I stopped pressing right, it kept goind right for a little while, and it lead to some frustration.
But overall, the game's great! The art is simple but good, and you made a reasonable amount of levels, I only had time for 3 in mine (if you want to check them out, it'd mean a lot). The touch of level 10 being much bigger than the others really gives it a nice touch.