Sure, I can create a playable horror game with the given requirements. Here's a sample implementation in HTML, CSS, and JavaScript:
Horror Maze Game
With this code, when you load the HTML file in a web browser, a horror maze game will appear. You can use the arrow keys to move the yellow player square around the maze. The red monster square will chase you randomly. If the player and monster squares collide, the game is over, and a pop-up message will show your score.
Please note that this is a simple example, and you can customize and enhance it further according to your requirements and preferences.