Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. The game involves protecting your money and camera from thieves using a robot equipped with a laser. The game will be playable on a smartphone and will use pictograms for visuals.
To play the game, simply copy and paste the above code into an HTML file, save it with a `.html` extension, and open the file in a web browser on your smartphone. You will control the robot using the arrow keys on your smartphone's keyboard. The objective is to move the robot and collect the money and cameras while avoiding collisions. The score will increase each time you collect an item.