Use the power of the chromatic armor to swap between two dimensions as you explore the facility in an attempt to find the source of the fracture that split the world in two.
A/D to move, W to jump, mouse or arrow keys to shoot, escape for the pause menu/map, and space to swap colors. You can change between different control schemes in the options section of the main menu.
Antichromatic uses stage3d which requires you to have an up to date flash player, and modern hardware. If you're experience slowness, try lowering the quality in the pause menu (escape) or the options section of the main menu.
If you get input lag, I would suggest trying another browser. On some setups chrome's pepper flash performs better, while on others the normal flash plugin does.