Sure, here's an example of a simple game called "Chaos Island" implemented as a single HTML file using JavaScript:
Chaos Island
In this game, you spawn on an island represented by a green square. Every 10 seconds, a random disaster (represented by pictograms) appears on the island. You can move the player (represented by a pink square) using the arrow keys to avoid the disasters. Your goal is to survive as long as possible and earn points for every second survived.
Note: This is a simple implementation to demonstrate the concept. You can further enhance and customize the game as per your requirements.