Sure! Here's a simple action game implemented as a single HTML file using JavaScript, enclosed in script tags. The game can be played on a smartphone and uses pictograms for the graphics.
To play the game on your smartphone, simply open this HTML file in a web browser that supports JavaScript. The player is represented by a smiling face ("🙂"), and the enemy is represented by a devil face ("😈"). Move the player by touching and dragging on the game canvas. The objective is to avoid the enemy for as long as possible and earn points. Once the player collides with the enemy, the game ends and a "Game Over" message is displayed. The score is shown at the top left corner of the screen.