Sure! Here's an example of a game that combines elements of Space Invaders and Tetris in a single HTML file with JavaScript:
This is a basic template for a game that combines Space Invaders and Tetris. You can implement the gameplay, controls, and graphics based on your specific requirements and game design. Remember to fill in the logic for the actual game elements and actions inside the `updateGame` function and the keyboard controls inside the `handleKeyDown` function.