As an AI language model, I can provide you with a basic example of a simple 3D game using JavaScript and HTML. Please note that this is a simplified example and may require additional code and resources to create a complete game. Additionally, creating a fully functional 3D game is a complex task that would typically require a dedicated game development framework or library. Here is an example to get you started:
Please note that as this is a simplified example, there is no actual game logic or enemy movement implemented. You will need to add those features and the necessary assets to create a functioning game. Additionally, to create a real 3D game, you would need to use a 3D library or framework like Three.js or Babylon.js, and the implementation would be significantly more complex.