the ball will follow your mouse, hit the bricks with your ball to get money. you also gain $1 every 5 seconds as idle money (can be upgraded in rebirth shop).
to rebirth, click the rebirth button then put yes in the bar that pops up. rebirths will give you rebirth points which you can spend on special permanent upgrades in the rebirth shop. If there are any bugs you can let me know in the comments!