It could have been Two Colors [LD35]

Once upon a time, there was a contest, called Ludum Dare. In Ludum Dare, you had to make a game in under 48 hours, the Art, Music, Sound, Design, and Programming all had to be done by one person within the deadline. It was a fun test of skills, problem solving, and realizing ones own flaws and how to work around them.However, on Ludum Dare 35, the theme was announced as SHAPESHIFT. And suddenly, in a hypothetical meta-plane of existence, a vortex was spawned, threatening to ruin your submission by distorting your creative though process in such a way to prevent you by doing anything original. ...