Sure! Here's an example of a game implemented as a single HTML file, using JavaScript and enclosed in script tags. This game is in pixel art style and features a story supporting the Purge, as requested. Keep in mind that this is a simple text-based game, but you can enhance it further with more graphics or gameplay elements.
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To play the game, you would open the HTML file in a web browser, and the game would present you with a story introducing the Purge and ask you to choose an action to survive. You can input your choice through the browser's console. Once you make a choice, the game will display the outcome based on your selection.