Sure, here's an example of a simple horror game implemented as a standalone HTML file using JavaScript:
In this example, the game sets up a canvas for drawing and handles touch events on mobile devices. Currently, the game only displays a basic red square as the player character. You can add your own horror-themed graphics and implement the actual horror game mechanics as per your requirements.
This is just a starting point for you to build on. Feel free to enhance and modify the game logic, add sound effects, and make it a truly terrifying horror game experience.