So we have our main concept: it is a level based platformer in which the character must meet the right visual condition to enter a door and complete the level (right colour/pattern etc.), there is one static level which is replayed with different conditions each time.

The guys are working away on the first milestone which is having a  basic level with platforms and collisions. Meanwhile I have been specifying the conditions/puzzles for the first levels and working on the character design: