 The former system of upgrading the vessel with a variety of defensive turrets has been simplified by fixing the player's view to the cockpit as well as permitting the usage of only two on-hull-installed cannons.As the result of this change, the controls of the submarine have been adapted to the first-person shooter's mouse-based layout, removing the need for the joystick, thus the game has compromised its tactical depth in order to increase the intensity of combat.This change has raised critique among the reviewers, stating that the developers' focus fell inadequately on the visual performance rather than the actual gameplay of its predecessor.