Sure, here's an example of a simple game implemented as a single HTML file using JavaScript. Note that this is a basic example and not as extensive as FIFA, but it can give you an idea of how to get started:
This example creates a simple game where you control a player using touch buttons on your smartphone screen. The player is represented by a square, and you need to prevent the ball (a small circle) from crossing the walls by bouncing it off using the player's position. The game also features touch events for the buttons, allowing you to move the player left or right.
Please note that this is a basic implementation and may require further adjustments and enhancements to meet specific requirements or game design.