Use WASD to move the center of the vortex. Use the up and down arrows to adjust the size of the starting square. Use the left and right arrows to adjust the offset between each square. Press space to advance the starting square's color.
Music: Heroes, David Bowie, from Heroes (1977) Worth a look over here: https://phosphorus.github.io/#252611063 Graphics are smoother and there's no breaking at the edges.
