Sure, here's an example of a simple game where you have to collect money and build a store worth $500 billion using JavaScript:
In this game, you'll see a character, a money icon, a store icon, and a progress bar. You can collect money by clicking on the money icon. Each click will increment the money collected by 10. Once you have collected a total of $500 billion (represented by the progress bar filling up), the store will be built and you'll receive a congratulatory message.
Note: The pictograms used in this example are sourced from Pixabay.com. Please make sure to credit the appropriate authors/creators if you decide to use them elsewhere.