Sure, here's a simple text-based Ether mining game implemented as a single HTML file with JavaScript, enclosed in script tags:
In this game, you start with 0 Ether and can click the "Mine" button to mine Ether. Each time you click, a random amount between 1 and 10 Ether will be added to your total. The current amount of Ether is displayed on the screen.
Keep in mind that this is a basic implementation and can be expanded upon to include more features or visual elements using pictograms or animations.