Sure, here's an example of a simple block breaker game implemented as a single HTML file using JavaScript and enclosed in script tags:
This code will render a block breaker game on a canvas element, allowing you to control a paddle at the bottom to bounce a ball and break bricks. The score is displayed on the top left corner, and the game ends when all bricks are destroyed or when the ball falls below the paddle.
Please note that this is a simple implementation and can be improved or extended further based on your requirements.