Very beautiful and polished game...love the art style. The mining felt seriously satisfying, sound effects and visual effects included. The mining environment felt empty though, maybe some prop elements other than the resources can be added. Also if the character is always in spinning motion that'll be really cool, and opens up a lot of room for adding juice in movement animations (instead of the battery, it can be durability which only goes down when it is mining).
Overall, it's a really awesome submission.