Cannon

Cannons (also known as Twin Turrets) are defenses that fire slow bullets, with moderate damage and fire rate, and high impact damage. It is seen as the bigger, bolder brother of the Turret and also shares the same range.

You can spam it, or simply build it as a backup close range weapon. It won't work well at long ranges as its bullet speed is substantially slower (unless the target is slow and big, in which case feel free to make them cry).