Sure! Here's a simple action game implemented as a single HTML file using JavaScript. It will be designed for smartphone operation and will include pictograms for the guns. Please note that this is a basic implementation and can be expanded upon to add more features and enhance gameplay.
This code sets up a simple game where the player can move left and right by touching the screen on a smartphone. The player can shoot bullets by tapping the screen. If a bullet hits the player or reaches the top of the canvas, it gets reset.
To enhance the game, you can add more enemy objects, implement scoring, levels, game over conditions, and much more.