Sure! Here's an example of a simplified implementation of the Flappy Bird game in a single HTML file using JavaScript:
In this implementation, the game can be played on a smartphone by tapping the screen instead of using the spacebar. The bird (represented by a yellow square) needs to avoid the green pipes by tapping to make the bird jump. If the bird collides with a pipe or hits the top or bottom of the canvas, the game restarts.
Note that this is a simplified version of the Flappy Bird game and may not include all the features or complexities of the original game.