Sure, here's an example of a simple game implementation in a single HTML file using JavaScript. The game involves a randomly generated maze, where you need to run from a ghost for one minute while trying to survive. You have complete movement control and can see the ghost chasing you around the map.
Maze Game
You can copy and paste the above code into an HTML file, and when you open the file in a web browser, the maze game will be ready to play. Use the arrow keys on your smartphone keyboard to move the player around the maze and try to survive for one minute while avoiding the ghost.