Sure! Here's an example of a simple zombie shooter game implemented as a single HTML file using JavaScript. The game can be played on a smartphone and uses pictograms for visual elements.
This example sets up a simple zombie shooter game where the player (represented by a police officer emoji) has to avoid colliding with the zombies (represented by zombie pictograms). The player can control the character using touch or mouse input. If the player collides with a zombie, a game over message is displayed and the game restarts.
Note that this is a basic implementation and can be enhanced with additional features like scoring, levels, and power-ups. Feel free to modify and expand upon it according to your requirements.