The Commander's Sister.

The main aim of this advanced turret defense warfare game is to prevent the enemy troops from reaching the northern part of the map.
With 12 units, a complete storyline and over 50 waves this game will simply amaze you.

Use the mouse and the keyboard to control this game.
Some handy shortcuts: C (construction area) H (health on/off) M (mouse scroll) G (global zoom) spacebar (cancel turret construction) R (repair turret) S (sell turret).