Sure, here's a simple implementation of a Marvel-themed tycoon game using JavaScript in a single HTML file:
In this game, you start with 0 money, 0 power, and 0 marvel points. You can click on "Collect Resources" to increment your money and power. Then, using the money acquired, you can purchase Marvel-themed items from the shop, such as an Iron Man suit, Captain America shield, or Black Widow gadgets, each with their own cost, earning power, and Marvel points earned. The UI dynamically reflects your current resources and allows you to make purchases.