This game has mouse and keyboard controls (but I think the mouse controls are better). With mouse controls, move your mouse around and your character will dig in that direction. With the keyboard, use the arrow keys to control your digging direction.

Dig into the earth and collect as many resources as you can before time runs out. Look out for clocks which will give you more time. Spend your resources to buy upgrades to dig faster, and see how deep you can go.