Sure! Below is a simple implementation of a game using HTML and JavaScript that can be played on a smartphone. The game is a basic space shooter where the player controls a spaceship and shoots down enemy ships.
To play the game, simply copy the above code into a single HTML file (e.g., "game.html") and open it in a web browser on your smartphone. The game will be displayed and you can control the player spaceship by dragging your finger across the screen. The objective is to avoid colliding with the enemy ships. If you collide with one, the game is over and a "Game Over" message is displayed.