Sure, here's an example of a simple ragdoll sandbox game implemented as a single HTML file using JavaScript. This game allows you to interact with a ragdoll character using touch controls on a smartphone.
To play the game, save the code above in a file with a .html extension (e.g., ragdoll.html) and open it in a web browser on your smartphone. You'll see a ragdoll character on the screen, and you can control its movement by touching and swiping left or right on the screen. The character will move accordingly, and you can see the updates in real-time.