Scratch

--Controls--
Arrow keys to move
Up arrow to jump
Space to change colors/views
'p' to pause.

--Story--
Square, the square was just a normal square, until one day, he realized if he pressed the 'spacebar' key, he could change the colors in his world to the opposite color! This was...well, sort of exciting, but then he realized something even more amazing- some things didn't change color, and so, therefore, he could go through things, and make them appear! This was nearly too much for Square, and he decided to go home and take a rest by pressing the 'p' key. He still couldn't rest, though, because his neighbor was blaring music out of his speakers, so he just muted the music by pausing, and clicking 'sound off'. Unfortunately for Square, he couldn't get off changing colors THAT easily, and was thrust into an alternate, 2D, one color dimension. Guide Square through the alternate dimension by changing colors, running, and jumping with the arrow keys!

Link:
http://scratch.mit.edu/projects/Sunrise-Moon/1240221