Loved the overall presentation of the game! Very charming with the animation and music, I especially loved the slowing/pitching down of the music at the lower level; that was an awesome detail!
These are some nitpick things, but (noticeably for the earlier tools), I was expecting it to break right where my crosshair was, but it seems to be based on the actual rotation of the tool? It got noticeable when I would try to make a sort of stair-like breaking pattern to get upwards, where I'd be aiming towards the upper block, but it would break the lower one instead. I also wished the caves were a little bigger, especially towards the end, it felt like I was having to go back up again and again, it kinda felt like I was 'resetting' and I would have liked to just grind out as much as I needed to get the next tool---completely understandable though given the size of the game and the timeframe you had to make it.
Overall really polished and a lovely game! :)