Infinite ammo.
AH... The robots are coming... To eat CAKE! You must stop them from getting their mechanical claws on the cake. It's your job to shoot all the robots before they can get to the cake. Thankfully, if you kill enough mechanical beasts, power ups will help you. Make sure you use them wisely as they can make the difference between saving the cake and losing it forever.
Use your mouse to shoot the robots and defend the cake. Make sure you shoot the power ups to help you fight off those cake eating mechanical monsters and save the day.