Sure! Here's an example of a simple game implemented in a single HTML file using JavaScript. The game involves bouncing balls, flashing background, rainbow text, and red cubes. Please note that this is just a basic example and can be expanded upon as per your requirements:
Welcome to My Crazy Game!
SO COOL
This is just a simple example of a game with bouncing balls and red cubes, along with a flashing background and rainbow text saying "SO COOL". You can further customize and expand the game according to your preferences and desired gameplay mechanics.