Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. It is designed for smartphone operation and uses pictograms.
In this game, you control a player character represented by a pictogram. The player can move left and right by touching and dragging on the screen. The objective is to avoid the falling enemy pictograms and survive as long as possible. The score increases by dodging enemies successfully. When the player collides with an enemy, the game ends and the score is displayed. To play again, simply refresh the page.