This is awesome! Everything about this game is great - the way you used the theme, the visuals, and especially the sound design, which is just amazing. The idea is really cool, and the ending is interesting too, especially how well it makes use of the jam limitation. While playing and repeating the timings, you can honestly just sit there and enjoy the satisfying ringing sounds of the pickaxe hits and the fragile cracking of the crystals.
Anyway, guys or girls, keep it up. I believe in you! :)