Today I've made a basic main menu for the game. On the main menu you can start a new game or continue your saved game. If you try to continue a saved game and you don't have a saved game yet, it will tell you so. If you try to start a new game and you already have a saved game it will tell you that you will overwrite your saved game by doing so, and ask you if your sure. This will only apply to the local saved games, in the Android version I will probably use Google Play Game Services and instead of it telling you that you will overwrite your saved game, it will open the list of your save game slots in GPGS. Here's a short video of the basic main menu: