Sure, I can help you create a picture-based game based on the story you provided. Here's an example of how the game can be implemented as a single HTML file with JavaScript, using pictograms:
Unicorn Rescue Adventure
This is just a basic framework for the game. You can extend it with more game logic, events, and picture-based interactions using HTML and CSS. Feel free to customize it further according to your specific requirements and add more features as needed.