Sure, here's an example of a simple game implementation using JavaScript, HTML, and CSS. In this game, you can control the main character "Leo" using arrow keys on a smartphone. Please note that this is a basic example and can be expanded upon to add more features and complexity.
To use this code, you need to save it in a file with a ".html" extension, add your own character image with appropriate styling and filename (e.g., "emozi_cat.png"), and open the file in a web browser on your smartphone. You can then control the character's movement using the arrow keys on the keyboard.
Please note that to fully develop a game, additional logic, interaction, and game mechanics will be required. This example provides a basic starting point for a character-controlled game.