Sure! I have created a simple Pixel RPG game for you with JavaScript. Here's the code for a single HTML file that you can run on your smartphone:
This code sets up a canvas element and draws a player character represented by a red rectangle. You can control the player's movement on smartphones by touching and swiping left, right, up, or down.
Feel free to add game mechanics, enemies, items, or any other additional features to make it a more complete RPG game.