Sure! Here's a simple RPG game implemented as a single HTML file using JavaScript and enclosed within script tags. The game can be played on a smartphone using the directional buttons for movement (up, down, right, left) and the spacebar to shoot enemies. The game uses pictograms for visual representation.
Please note that this is a simplified version of an RPG game and lacks advanced features, levels, and enemies. It's meant to give you a starting point that you can expand upon based on your requirements.
Feel free to modify the code and add your own game logic, levels, enemies, and graphical assets to create a more complete RPG experience. Good luck with your game development!