Sure! Here's an example of a simple shooting game implemented as a single HTML file using JavaScript. The game can be played on smartphones and uses pictograms for visuals.
This game allows you to control a player using touch input on a smartphone. You can move the player by touching the left or right side of the screen. To fire a bullet, simply lift your finger from the screen. The goal is to shoot down as many enemy targets as possible while avoiding collisions with them. The current score is displayed on the screen, and the game will end when a collision occurs, showing the final score.