Sure! Here's a sample RPG game implemented as a single HTML file using JavaScript:
In this simple RPG game, you play as the "Player" and encounter an "Enemy". You have a starting health (hp) of 100 and an attack power of 10, while the enemy has a starting health of 50 and an attack power of 5. By clicking the "Attack" button, you initiate an attack on the enemy and the game logic will calculate the damage dealt. If you defeat the enemy, a victory message will be displayed. Conversely, if the enemy defeats you (your health drops to 0 or below), a game over message will be displayed.