Sure, here's an example of a simple game implemented in a single HTML file using JavaScript and enclosed in script tags. This game allows players to mix superpowers and create new ones:
Superpower Mixer Game
In this game, players can select two superpowers to mix by clicking on the corresponding pictograms (images). After selecting the powers and clicking the "Mix Powers" button, the game will randomly generate a new power by mixing the selected powers. The newly created power will be displayed on the screen.
Please note that you need to replace the image sources in the `<img>` tags with the actual paths to your desired pictogram images. Additionally, you can customize the logic in the `mixPowers` function to mix the powers according to your desired rules.