Sure! Here's an example of a simple horror game called "The Furry Friends" implemented as a single HTML file. Please note that this is a basic implementation to give you an idea, and you can expand upon it further to add more features, levels, or improve the gameplay.
The Furry Friends
In this game, you start as a child exploring an abandoned pet store and have two items in your inventory: a black light and a gun. The black light reveals hidden messages on the walls, and the gun shoots tiny lightning bolts to power up generators that open doors.
By clicking the "Interact" button or using the `action-button` event, you can interact with the environment depending on the current image displayed. If you're chased by the mutant cat, you need to run away by clicking the button before it catches you. If you're in front of a hidden message, it will be revealed. If you're in front of a generator, you can power it up with the gun.
Clicking on the inventory items (black light and gun) will decrease their quantity by one.
To reset the game, you can press the "R" key on your keyboard.
Note: The images used in the example are placeholders and you can replace them with appropriate pictograms or actual images in your implementation.