Sure! Here's a simple game called "Circle vs Square" implemented as a single HTML file using JavaScript. It supports multiplayer mode for smartphone operation and uses pictograms.
To play the game, copy the above code and save it as a `.html` file. Open the file in a web browser on your smartphone, and you should be able to control the circle using the up and down arrow keys, and the square using the "W" and "S" keys. The goal is to avoid colliding the circle with the square for as long as possible. If a collision occurs, a game over message will be displayed, and the game will reset.