Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. In this game, you control a square using the arrow keys. The square moves within a box, and if it goes off-screen, it gets teleported to the left side. Additionally, every 5 seconds, the square becomes more corrupted.
To play the game, you can copy this code into a blank HTML file and open it in a web browser. Use the arrow keys on your keyboard to control the square within the box. The square will get teleported to the left side if it goes off-screen, and it will also become more corrupted every 5 seconds.