Okay, here's an example of a simple implementation of a Flappy Bird game in a single HTML file using JavaScript. Please note that this is a simplified version and may not include all game features or animations.
In this implementation, the game is played on a canvas element. The player controls the bird by pressing the space bar to make it jump. The goal is to navigate the bird through the gaps between the green pipes to earn points. The game will end if the bird hits the ground or any pipe. A score is displayed at the top left corner of the canvas.
Please note that you will need to provide your own `emozi_all/bird.png` file as the pictogram for the bird. Also, this implementation doesn't handle touch events for smartphone operation, but you can easily add touch event listeners to enable touch controls.