Sure! Here's an example of a simple game called "Current Battery" implemented as a single HTML file using JavaScript and enclosed in script tags:
Current Battery Game
This game is designed for smartphone operation. It displays a canvas where the player (represented by a blue circle) can be moved horizontally by touching and dragging on the screen. The goal is to avoid the battery level (represented by a red rectangle) from reaching 0. The battery level gradually decreases over time, and if it reaches 0, the game ends and a game over alert is displayed.
You can further enhance this game by adding more features, levels, and interactions based on your requirements.