Sure! Here's an example of a simple game implemented as a single HTML file that you can play on a smartphone. The game involves firing guns that shoot guns (represented by pictograms):
This HTML file sets up a canvas element to render the game graphics. The game logic is written in JavaScript and enclosed within `
` tags. The player controls the gun's movement by touching and dragging on the screen. Tapping on the screen fires a bullet. The game loop continuously updates and renders the game objects, including the player's gun and the bullets on the canvas.