There has been many good tower defense games but here we have one that many would argue is one of the best of the lot and there are points in the game to justify these claims. Here in the game, the evil and mysterious aliens have proclaimed attacks on the planet Mavas. You being the saviour of the Utans will need to lead the side to fight against the aliens and fail their plan of invasion. Place unique units the game has to offer in tactical positions in order to confront the enemies. Upgrading the units on regular basis is no less important a task that you must handle wisely in order to be more effective against the invading opponents.