Sure, I can provide you with a simple text-based game template that incorporates the themes of steampunk and cyberpunk in an open world JRPG style. Please note that this is just a starting point, and you will need to expand upon it to make it a full-fledged game.
Here's the HTML file containing the JavaScript game code:
This is a basic template that allows the player to navigate through the game world, encounter enemies, and initiate actions. However, as an open-world RPG game, it's recommended to expand on this template by implementing more game mechanics, quests, character progression, visuals, and other features to make a complete and enjoyable game experience.