Sure! Here's an example of a simple game written in a single HTML file that uses JavaScript and can be played on a smartphone. It's a game where the player needs to dodge falling objects. Since you mentioned using pictograms, I'll implement it using emoji characters as visual elements.
To play the game on a smartphone, simply copy and paste the above code into an empty HTML file, open it in an internet browser on your smartphone, and start playing by tapping the screen to move the player left or right. The goal is to dodge the falling objects and survive as long as possible. Good luck and have fun with the Bad Time Simulator!