The green block is your main character and you use the arrow keys to control it. The goal of the game is to get to the spaceship, to avoid the lava (the red), and the laser (the yellow line) which is always close to the black box with a red circle inside.
Every level is possible, most of the green block scripts I got from maciek-mario, and his project Pingle (a platformer). There is going to be a sequel.