You have been charged with a cursed laser. If this laser overheats it will explode, destroying you and who knows what else. You must decide if you will use this laser for good or for evil.
If you choose the path of good then you must attempt to keep the laser from overheating without killing anyone. Firing the laser, which can be done with any button, lowers the heat, but be careful not to kill any civilians. Kill four civilians and it's game over.
If you choose the path of evil then you must attempt to kill all the bystanders without letting the laser overheat. Firing the laser, with any button, causes its heat to rise . Try to not let any bystanders get past while also not letting the laser overheat.