As a language model AI, I can provide you with a simple example of a game implemented as a single HTML file using JavaScript. Please note that the game below is just a basic example and can be modified and expanded upon further.
🎮
In this example, a simple game is displayed on the smartphone screen as a game controller emoji "
🎮." When the user taps on the game container, the score increments by one, and the updated score is displayed. The game ends when the user decides to stop playing, and the final score is shown. The game can be reset and started again by reloading the page or calling `resetGame()` function.