The sketchy graphics of the game is probably the highlight of the game. You must not expect exceptional differences from the regular defense based games that we find online but the game is still worth playing. There are some interesting options like Survival Mode, Mission Mode and Editor Mode, which will likely catch your attention. Use the limited money to buy the most effective towers and turrets from the available options and place them on the map to eliminate the invading waves of the enemies. You may control the speed of the enemies but what really counts is how well you place the attack units to confront the enemy invasion.