Sure! Here's a simple High School Simulator game implemented as a single HTML file with JavaScript code enclosed in script tags:
This simple game allows the player to control a character (represented by a pictogram) using the arrow keys on their smartphone. The player can move the character around the canvas within the boundaries. The character is represented by the "👩🎓" pictogram, but you can replace it with any other pictogram that you prefer.
Please note that this is a basic example and can be further extended to include more features and gameplay elements based on your requirements.