Sure, here's an example of a simple number counting game implemented as a single HTML file using JavaScript. The game can be played on a smartphone and uses left and right arrows (⬅️ and ➡️) as pictograms for navigation.
This game allows the player to click the left arrow (⬅️) to decrease the displayed number or the right arrow (➡️) to increase the number. The number is initially set to 1 and the game ends when the displayed number reaches the maximum number (10 in this case).