If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In the future, robots and humans live in unity. This creates an ideal utopian society filled with peace and prosperity...but as utopias have a way of doing, this one begins to fail as well. The Robot Lord decides that robots would be better off without the humans and orders all of the robots to attack! Its your job to rise against the robots and save humanity by activating the turrets used to protect the city. Good luck!