Aether

According to the font of all knowledge (and, ahem, wikipedia, ahem) Aether is apparently the elemental Greek God of the bright, glowing, upper air. It also seems to be a rather interesting platformer with a whiff of puzzle-solving and a dash of space exploration chucked in for good measure.

After the poetic introduction has explained your mission of friendship and happiness, you must defy gravity and launch yourself in to space atop your alien steed. At first it's hard to master the controls and actually work out what you have to do, apparently you must restore the colour to the washed out worlds you visit. This is done by solving the puzzle on each world. These normally revolve around loneliness and insecurity... heavy stuff.