Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript:
This game sets up a canvas element where you can control a black square using touch or keyboard arrow keys. When the user touches or holds the left half of the screen, the square moves left, and when the user touches or holds the right half, the square moves right. Similarly, touching or holding the top half moves the square up, and touching or holding the bottom half moves the square down. Keyboard arrow keys (up, down, left, and right) function the same way.
This is just a simple example to demonstrate how to create a basic game. You can modify and enhance it as per your requirements, including adding pictograms, additional game mechanics, and win/lose conditions.