Sure, I can help you create a simple game using JavaScript enclosed in script tags in a single HTML file. Here's an example of a game where you control a helicopter on a smartphone using pictograms:
This is a simple game where you control a helicopter using arrow keys or touch-based movement on a smartphone. The helicopter moves in the direction of the arrow keys or the position you touch on the screen. The game is displayed on a full-screen background and the helicopter is represented by a helicopter pictogram.
You can save this code into an HTML file to play the game in your web browser.