Defender

Game description:

Defender is a game of tactics, strategy and decision-making. Each level is consist of waves of enemies wherein you must prevent them from reaching the exit points. Each enemy kill is rewarded with points to purchase your defenders to be placed on pavements, or make a new pavement. Good luck and have fun!

Game controls:

Mouse - To interact.
Spacebar - Cancel current bid order.
Shift - Hold down to place multiple defenders of the same type.