Sure! Here's a simple shooting game implemented as a single HTML file using JavaScript. The game is designed for smartphone operation and uses pictograms.
To play the game, simply open the HTML file on your smartphone device. The player can be controlled by moving your finger horizontally on the screen, and bullets are fired automatically when you tap the screen. The objective is to shoot the enemies approaching from the top while avoiding being hit by them. The game ends when an enemy reaches the bottom of the screen or when the player collides with an enemy. Your score is displayed at the end of the game.