Very nice concept that is executed pretty well. Starting off, Main Menu!, good stuff on the buttons and the general design, However, There is not much use for a exit button in a web game, easy to look past. The Model of the Sub is very nice and detailed, with it being given a lot of life with the animated propeller + Bubbles. Shooting is very nice and responsive with nice audio feedback from firing and hitting the ducks. Only things that are missing are a lack of a game end or score system and the level turns out to be quite small. Overall very nice and simple game with a great execution.