Giants and Dwarves TD

The clash between the good and bad are always there. It can't be help as one wants to conquer the other one.   As always, the good ones always prevail, but for how long?  The lord of the dark has called in some of his mightiest soldiers.   The game is played via mouse and the idea here is to build towers that will defend the empire.  No enemies shall be allowed entrance to the castle. You got a hero to defend it with and some men.  You get money on each kill, but you can only upgrade teh hero and the men after each level.