A very cool game.
Honest, it took me a good while to figure out what exactly to do. But once I figured it out, it became an insanely interesting puzzle game between knowing when to dig and when to wait.
The dichotomy between the only 2 main decisions that you have is an amazing!
I thought at first that this would make the waiting part kinda boring when you know where to dig, but man was I wrong. The music, the red line coming nearer to you. Everything makes your heart pumping.
Not to mention the polishing. And oh boy is the polishing positively absolutely fantastic!