Sure! Here's an example of a simple FPS shooter game implemented as a single HTML file with JavaScript:
This is just a basic template for an FPS shooter game. Additional logic for enemy AI, shooting mechanics, levels, and game over conditions can be added to make the game more detailed and challenging. Remember to replace the placeholder rendering code with actual graphics or pictograms for better visual quality.
Note: Creating a fully detailed and high-quality FPS shooter game would require significant development time and expertise. The provided example serves as a starting point for implementing an FPS shooter game using HTML, JavaScript, and pictograms.