A free program for Mac, by Jordan Bleu.

Help Happy Robot finish his missions! To do that, you will use his abilities to overcome obstacles, avoid traps and collect all the stars found in his path. Happy Robot moves automatically. You only need to control him with a joystick or a touch screen. You must make your way through the level to the exit portal, avoiding spikes and other obstacles that prevent you from reaching your goal. Although such a goal might sound simple, it’s not as easy as it sounds. Each level will present new challenges and obstacles you’ll have to overcome if you want to get that far. Find out the meaning of happiness by playing through a series of levels featuring challenging puzzles, cute 2D graphics, and cheerful music.