Here's a basic implementation of the game "Galactic Guardians" in a single HTML file using JavaScript and enclosed in script tags:
Please note that this is just a basic structure to get you started on your game. You'll need to add game logic, controls, additional elements, and graphics based on your specific game requirements. The spaceship image should be placed in the same folder as the HTML file with the name "emozi_all/game.png" for it to be displayed properly.
Make sure to continue building upon this structure to create a complete and enjoyable game experience. Good luck with your game development!