Sure! Here's an example of a simple game where you need to prevent towers from getting hit by a plane. It is implemented as a single HTML file and uses JavaScript. The game will start as soon as you open the HTML file on a smartphone.
In this game, you control a plane and need to avoid towers. The plane starts at the left side of the screen and moves to the right. You can control the plane's vertical position by touching and dragging on the screen. If the plane collides with a tower, the game is over and the "Game Over!" text is displayed.
To restart the game after it ends, simply touch the screen again. The score will also be displayed while the game is running.
Please note that this is a simple example and can be further enhanced with additional features, levels, and visual improvements based on your specific requirements.