Sure, here's an example of a simple horror game implemented as a single HTML file using JavaScript. It is designed for smartphone operation and uses pictograms for the interface. Note that this is just a basic implementation for demonstration purposes, and you can expand and customize it as per your requirement:
Horror Game
In this game, you navigate through different rooms in a haunted house, making choices that affect your gameplay. The game starts with the `startGame()` function, and you can play by tapping the given options/buttons on your smartphone to progress through the game.
Please note that this is just a basic implementation to give you an idea, and you can add more rooms, events, and interactions to make it more interesting and engaging.