Who can get through a dense defense and attack your main hero? Nobody! Tower Defense game gets here with one interesting aspect brining more strategy content.
And who they want to get? Your main hero, who is the more specific part of the game. You can move with his and so create path. Build your defense along it and with every progress you get more move points. The main character can be even sold and the new put somewhere else. The possibilities are rich and various. It’s really fine and great game.