Sure! Here's a simple shooting game implemented as a single HTML file using JavaScript. It can be played on a smartphone and uses pictograms for visuals.
Shooting Game
To play the game, you can simply copy and paste the above code into an HTML file and open it in a web browser on your smartphone. Use the left and right arrow keys to move the player, and tap the screen or press the spacebar to shoot at the enemies. The goal is to avoid the enemies reaching the player and shoot down as many enemies as possible.