Your bloodstream is being infiltrated. Take control of your white blood cells and swarm together to fight off dangerous bacteria. Highly recommended to play with a gamepad (Xbox 360 preferred) for a fully immersive experience, try it to find out!
Collect smaller white blood cells, progress through the tunnels (veins) and attack the enemy bacteria, hold space key or A on Xbox 360 controller to attack.
Installation and other info in the readme.txt file.