Sure, here's a simple implementation of a 3D FPS game using HTML, JavaScript, and emojis as pictograms. The game involves a player shooting emoji enemies using a gun with infinite bullets. It's important to note that this is a basic implementation and lacks advanced features and graphics.
Note: This is a basic template to get you started with a game like this. You can enhance it further by adding more sophisticated gameplay elements, graphics, sound effects, and enemy AI.