Right now you can't play the game. To finalize the
OnUpdate method and the gameplay in general, we need more helper (support) methods. If you create smaller methods for more detailed tasks, it is easier to interface with them in other places and also easier to maintain.
To show the high score list, we first need a function that will load it from the app state. As the app state is just a string of characters, we will utilize the
LoadFromString method of the engine's score list.