The listing, Mu Cartographer [Steam Key] has ended.
Mu Cartographer is a contemplative game experience which combines colourful sandbox and experimental treasure hunt.
Manipulate an abstract machine that gives you the power to modify the topography and colours of the circular landscape in the middle of the screen. It also allows you to wander through the land and find treasures, stories and other mysteries hidden in the shifting world.
More info: http://store.steampowered.com/app/513360/
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This game works on mac too!
Good Luck!