Sure! Here's a simple example of a game that meets your requirements:
Please note that you need to provide your own jumpscare sound file named `jumpscare.mp3` in the same directory as the HTML file for the jumpscare effect to work.
This simple game creates a canvas where a red square represents the monster, and a blue square represents the player. The monster constantly moves towards the player, and if the monster touches the player, a jumpscare sound is played, and the game ends. The player can be moved using the arrow keys. There's also a clock on the screen that updates in real-time. If the clock hits 7:00:00 AM, you win the game.