Sure, here's an implementation of a simple Snake Game in a single HTML file using JavaScript and pictograms. It is designed for smartphone operation.
Note: Please make sure to replace the "emozi_all/pictogram.png" URL with a valid URL to the pictogram you would like to use.
The game grid is represented by a 15x15 grid, and the snake is represented by the "S" pictogram while the food is represented by the "F" pictogram. The player can control the snake's direction by swiping on the game area. The game ends when the snake collides with walls or itself.
Feel free to modify the code as per your needs and add more features to enhance the game.