You control that green thing.
"Race to the Bottom" is an very interesting experimental game. Interesting are the game mechanics: you control the game just by pressing any key. Your goal is to escape from the worm. By doing this you have to navigate you player, that is some kind of "bipad". You toggle the control points by pressing the key and have to surf the gravity to get into speed and action. It's easier than it sounds. Best, simply check it out.
It somehow reminded me on robotic locomotion. This game is locomotion training!