Sure! Here's an example of a simple game called "Charle Charle with 2 minutes Jumpscare" implemented as a single HTML file using JavaScript:
Click to start the game!
Time remaining: 120 seconds
In this game, the player is instructed to click on a pictogram to start the game. Once started, an image of "Charle" appears and a timer starts counting down from 2 minutes. If the player fails to click on "Charle" before the time runs out, a jumpscare image is displayed.