As an AI text-based model, I can provide you with an example of a simple game implemented in a single HTML file with JavaScript. Please note that this is just a basic template to give you an idea, and you can modify and enhance it according to your requirements. Here's the code:
Babysitting Game
Tap or click on the child to keep him safe!
⚠️
To play the game, open a new HTML file in a web browser (e.g., Google Chrome), copy the code above, and save it with a .html extension. Open the saved file in the browser, and you should see the Babysitting Game interface. Tap or click on the "⚠️" pictogram to keep the child safe. The game lasts for 10 seconds, and the final score will be displayed in an alert dialog at the end.
Please note that this is a very basic implementation, and you can add more features, complexity, and styling to make it a more engaging and interactive game.