A screenshot showing the towers placed as well as the menu for placing the towers. The game is completely controlled by the keyboard: Arrow keys to move the cursor, Enter to place towers, Space bar to start the waves of enemies, etc. As shown there are four types of towers with various costs, damages and ammunition storage. The red, yellow and blue towers damage enemy boats whereas the green tower slows them down.
Another screenshot showing the progression of enemy boats. These are the simplest enemies and thus the easiest to destroy.There are five enemy types starting from the basic coats shown above, progressing to enemy boats of with higher hitpoints and faster speeds, and ending with a boss ship.