Okay, let's create a Space Invaders game with an Atari 8-bit feel, including a menu and game modes.

We'll start with the HTML structure, CSS for basic styling, and JavaScript for the game logic, menu, and entities.

This sets up the basic structure:

1. HTML: Creates the canvas element.
2. CSS: Styles the page and canvas for an old-school look.
3. JavaScript:
   • constants.js: Defines game parameters like sizes, speeds, colors, states, and modes.
   • utils.js: Helper functions for drawing shapes and text.
   • input.js: Handles keyboard input.
   • player.js: Defines the player object (drawing, movement, shooting).
   • bullet.js: Defines the bullet object.
   • alien.js: Defines the Alien class and the AlienFleet class to manage the grid, movement, and shooting.
   • menu.js: Handles drawing and logic for the main menu and difficulty selection.
   • game.js: The main game class that ties everything together, manages game states (Menu, Playing, Game Over, Level Transition), the game loop, drawing, updates, and collision detection.

Now you can run this. Use the arrow keys to navigate the menu, Space/Enter to select a difficulty and start the game. In-game, use Left/Right arrows to move and Space to shoot.