Press the roll button to earn points. Spend your points to upgrade your dice or buy new ones. More choices open up the longer you play.
Click Space to roll, or just wait and let the auto-roll do the work. Each time you roll you earn points, which you can spend to upgrade your dice or buy new ones. More items open up the longer you play, use them to make your dice more valuable.
They keep rolling even if you close the game, so when you come back you might have earned thousands of points or more!