/bound/: tied; in bonds. One circle revolves around on the other. Press space to change which. Red bullets can't touch blue, blue bullets can't touch red, simple as that. "Attack" a turret and score a point. "Attack" a turret with the opposite color and also get 2 lives.
They're stuck together. They're on opposite sides. But they need to work together to survive. You will probably get frustrated by the fact the circles don't move fast enough for you. Plan your dodges and know when the wave of bullets come. Music: Sugar (Instrumental) - Robin Schulz