Your aim in this nice game with perfect graphics is to defend your base against enemy attacks by shooting them with your cannon. To complete a mission you should destroy all the enemies without letting them to damage your cannon. You will earn cash in every level. You can use the cash to buy new units or to repair existing ones. To buy new units, click the build unit button on the top right side and select the desired unit. To repair all units click the repair unit button on the top right side. You can also repair or sell individual units, hold down your SPACEBAR and click on desired unit. Use YOUR MOUSE to aim the cannon and click LEFT MOUSE BUTTON to shoot. Enjoy!