Let there be light!
Lightformer was written in Processing and uses the webcam.
When the game starts you have 20 seconds to shine light into the webcam on your computer such that you create a terrain for your avatar to move around on. Then you try to reach the sparkling square that represents “victory” in the game. And that’s it. Controls are arrow keys + R to restart a level + click to skip the countdown when using the camera.