Good atmosphere, entertaining gameplay. Surprised at how much strategy there was on top of the luck.
Unfortunately, by level...15 or 16, I'm not sure...the grid takes up so much space that not only can you no longer see the level number or the number of shovels left, you can't even see the edges of the grid. Maybe it needs a panning mechanism? (Get it? Panning for gold? Because you...never mind.)