Sure! Here's a simplified example of a computer horror game implemented as a single HTML file using JavaScript. Please note that this is just a basic template and you would need to add more game logic, graphics, and features to make it a complete game.
This is a simple template where you can control a red square (player character) using touch events on a canvas. You would need to further develop the game by adding in-game elements, levels, enemy interactions, and more. But this can give you a starting point. Remember to replace the placeholder code with your custom game mechanics, graphics, and sound effects to create a full-fledged horror game experience.