Sure! Here's a simple game implemented as a single HTML file using JavaScript. It is designed for smartphone operation and uses pictograms:
This game is called "Particle Game". It starts when you tap/click on the screen, and particles of different colors will start moving around randomly. Your goal is to tap/click on the particles to remove them from the canvas. Each time you successfully tap/click on a particle, your score will increase. The game is over when all particles are removed from the canvas, and the final score will be displayed in the center of the screen.