Sure! Below is a simple example of a game implemented as a single HTML file, using JavaScript and encased within script tags. The game is designed for smartphone operation and uses pictograms.
This game is a simple touch-based game where the player needs to touch the moving ball to increase their score. The game loop continuously updates the ball's position, checks for collisions with walls, displays the score, and ends the game when a touch event ends. The player's score is shown at the top left corner of the canvas, and when the game ends, the text "Game Over" is displayed.