Sure! Here's an example of a simple AI horror game implemented as a single HTML file using JavaScript. The game is optimized for smartphone operation and incorporates pictograms for a user-friendly interface. Please note that this is just a basic implementation and can be expanded upon to make it more interactive and engaging.
In this game, the AI mascot's mood randomly changes between happy and scary. When the player taps on the screen, the mascot's mood is revealed. If the player taps on the screen while the mascot is in a scary mood, the game ends. To restart the game, the player can tap on the screen again.
Please note that you can further enhance this game by adding more features, levels, or challenges. Feel free to modify and expand upon the provided code to create a more comprehensive game experience.