Sure! Here's a simple implementation of the game Flappy Bird using JavaScript within a single HTML file. It is designed to work on smartphones and uses pictogram-like images to represent the game elements:
To play the game, open the HTML file on your smartphone or emulator. The player controls the flappy bird by tapping/clicking on the screen, causing it to jump and avoid hitting the pipes. The score increases as the bird successfully passes through the gaps between the pipes. The game will show a game over message with the final score and provide an option to play again.