Very stupid humour, loved it.
Could do with better controls, the mouse/kb combo doesn't feel quite right. If you want to prevent spamming you could add a few frames to the dig animation and stop movement while doing it. You would have to update the AI too.
Or you could have it that if you dig on an already dug square there's a chance you ruin what you found (and deduct points accordingly)
There's a lot of scope for expanding this game.