Sure! Here's a simple game implemented as a single HTML file using JavaScript, enclosed in script tags, designed for smartphone operation:
The above code sets up a simple game where the player (represented by a blue rectangle) needs to reach the goal (represented by a green rectangle) by moving in different directions using the arrow keys on a smartphone keyboard.
When the player reaches the goal, an alert is shown congratulating the player. The game runs inside a canvas element and utilizes basic JavaScript for handling player movement and rendering the game objects.
You can save the code as an HTML file and open it in a web browser, preferably on a smartphone, to play the game.