Sure, here's an example of a simple game implemented as a single HTML file using JavaScript. The game is based on Iron Kirby, and it's designed for smartphone operation. It uses pictograms to represent the game elements. You can copy and paste the code into an HTML file to play the game.
Iron Kirby Game
Note that you'll need to replace the `'emozi_all/player.png'` and `'emozi_all/enemy.png'` with the actual paths to your own pictograms or sprites for the player and enemies.