Created by Belén Albeza for Ludum Dare 38 "It's a terraforming game with two game modes: quest (in which you have to solve a "puzzle" and learn the rules of the simulation) and freestyle, where you get to build a world of your liking."
There's a really interesting 'making of' blog post to go with it, and the game is great fun. Well worth trying to see if you can complete Quest mode!