Sure! Here's a simple game where tapping on the screen will draw a circle using JavaScript and HTML:
This game uses JavaScript and HTML to create a canvas element that fills the screen. When you tap/click on the canvas, it will draw a circle with a radius of 50 at the position where you tapped/clicked. The canvas is cleared every time you tap/click, so you can draw multiple circles by tapping/clicking multiple times.
Remember to enclose the above code within the script tags in your HTML file. You can save this code in a single HTML file and run it in a web browser on your smartphone to play the game.