Sure! Here's a simple implementation of the Flappy Bird game as a single HTML file using JavaScript:
To play the game, you can copy and save the above code into an HTML file (`flappy_bird.html`) and open it in a web browser. The game will start automatically, and you can control the bird's jump by clicking the canvas or pressing the spacebar on your smartphone's keyboard. The goal is to avoid the obstacles by passing through the gaps. The game ends when the bird collides with an obstacle or goes out of bounds. A game over message will appear, showing your final score.