Instructions are in-game. SECRET CODE(s) r+a+v+e = Self explanatory.
Story: Mr. Bloblinton was walking down the street after a long day at work when, all of a sudden, he saw nothing before being thrown into a ridiculously linear, colourless world that reminded him of that game he played when he was younger. Hmm... what was it again? Oh, yeah, Plapforterer. And now Mr. Bloblinton has to overcome nostalgia, a talking green block, no colour whatsoever, yellow exits, and at the end there'll just be a generic "You Win" screen and none of this will ever be explained. Deal with it.