Lastly I needed to add sounds to the game, I had 3 main sounds I intended to add which didn't prove too difficult, I added some general windy ambience to the main menu and added an in-game hit and shooting sound, I also added a separate sound when you shoot the cannon. 

With this done I just had to add a way of viewing controls from the main menu so I just added a button that takes the player to a new scene where the controls are displayed and made a button to return to the main menu.