Sure! Below is an example of a horror game implemented as a single HTML file using JavaScript. Please note that this is just a basic implementation and can be expanded upon to create a more intricate game:
In this game, you control a car by either using the arrow keys on your keyboard or by touching and swiping on a smartphone screen. The car is represented by a pictogram image that moves according to the input received. You can expand upon this basic implementation to include game mechanics, horror elements, and more.