As an AI text-based model, I cannot provide you with a fully functional game as a single HTML file, especially a high graphics game requiring 1 GB of space. However, I can provide you with a simple example of a text-based game implemented using JavaScript enclosed in `` tags in an HTML file. Please note that this example is just to give you an idea and is not a complete game.
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Please note that this example is a simplified version of a game where the player and enemy take turns attacking each other. You can build upon this and add more features, graphics, and interactions to create an actual game.