Simple and elegant! I like this take on dungeon crawling, although it feels like it could use just a little more going on - solid walls you can't mine through? Teleporter to get back quickly? I enjoyed it nonetheless! Decided to keep playing (until the 40k mark) with a podcast on in the background for some nice, chill relaxing =).
Also, the Mining minigame worked much better when I figured out it was registering on key-up instead of key-down (which means, hold the key right away, then release in the bar, instead of trying to press in the bar, which always made me late ^_^), woulda perhaps felt more responsive (the movement too), if it were on key-down instead.