"This is a love story. Once upon a time there lived two pencil erasers that were deeply in love. She was smart and beautiful. And he was the happiest eraser in the world. Until one day."
Your character moves automatically, you just have to press CTRL to make him jump, or ALT to slow him down. There are 50 levels in total (although I confess I didn't see them all), and you just have to reach the rocketship at the end of each level.
It starts quite simple - just press CTRL to jump and reach the rocket. Then you have to collect stars, and then you have to walljump (hint: to get past level 3 with walljumping, just hold CTRL down and he'll walljump up automatically).