Sure! Here's an example of a simple game where you can shop for items using virtual money, and you earn money every 5 seconds. The implementation is written in a single HTML file enclosed in script tags:
The Shop Game
Earn money every 5 seconds and use it to buy items from the shop!
Money: $0
Shop
Please note that this is a basic example to demonstrate the game mechanics. You can enhance it further by adding more items, improving the UI, and customizing the game logic according to your requirements.