Sure! Here's an example of a simplified Flappy Bird game implemented as a single HTML file with JavaScript, using pictograms for the game elements. Please note that this is just a basic implementation and can be further enhanced and styled as per your requirements:
To play the game on a smartphone, you can simply open the HTML file in a mobile browser that supports JavaScript. You can control the eagle's movement by tapping anywhere on the screen to make it flap. The goal is to navigate the eagle through the gaps between the pipes without touching them. Your score will increase for every successful gap passage. If the eagle collides with a pipe, the game will end and a Game Over message will be displayed with your final score.