Sure, here's an example of a simple text-based game about a girl surviving in a zombie apocalypse. It's implemented as a single HTML file with JavaScript enclosed in script tags:
Surviving the Zombie Apocalypse
Use the buttons to make decisions and try to survive!
This is a basic structure for the game, and you can expand on it by adding more scenarios, choices, and outcomes. You can also enhance the game with pictograms and interactive elements specific to smartphone operation. Remember to customize the game logic to your desired storyline and outcomes. Good luck!