Sure, here's a simple implementation of the snake game using HTML and JavaScript, optimized for smartphone operation:
Save the above code in a single HTML file. When you open the file in a web browser, it will load the snake game. You can control the snake by swiping on the game board's screen using your finger on your phone. Eat the apple emojis to grow the snake, and avoid colliding with the snake's own body or game boundaries. Enjoy playing!