Pop the bubbles - don't let them get to the edge of the screen! You start with 100 lives and lose one every time a bubble crosses your screen. You can pop the bubbles with the webcam by moving your body. To increase your lives, you can buy a finger, and arm or a robot. These are bought with bubbles that you have popped before.
Inspiration from @cstem1515 and the Scratch Team. Thank you!