Sure! Here's a simple turn-based RPG game implemented as a single HTML file using JavaScript and emojis:
This game sets up a simple battle between a player emoji and an enemy emoji. The player can attack by clicking on the game screen, and the enemy automatically attacks after the player's turn. The game keeps track of each character's health and displays messages about the actions taken during the battle.
Please note that this is a minimal implementation and can be expanded upon to include additional features, levels, graphics, etc.