You will eventually want to make a game state/mode variable to keep track of what state your game is currently in too. ie Intro screens, main menu, in-game play mode, in-game pause mode, end game credits and so on. You'll have to determine for yourself what you need based on how you organize your code. But do organize it so that it's easy to come back to later. It make later development and updating older projects so much more easier when you took the time to comment and keep your code orderly.