You control both, white and black characters. Use arrow keys to move them. The white character is normal, but the black one as the laws of gravity going up, and the controls are inverted. Get both of the characters the their own portal (White to white, black to black).
This is sortof a work in progress, so it's not really finished, but my siter wanted to plat it, so I just kinda shared it. There are only four levels, then after that, they just continue to cycle through. Like I said, a work in progress. Nobody reads this, do they? If you read the Notes and Credits, comment "Chicken Noodle SoOUp".