Sure! Here's an example of a game similar to Flappy Bird, but with added features such as changing pipe sizes, moving pipes, rotating them, and introducing enemies and bosses. The game is implemented as a single HTML file and enclosed in script tags:
Please note that this code provides a basic structure with the requested features, but it is not a complete, fully polished game. You may need to add additional functionalities, graphics, and game logic to make it more enjoyable. Feel free to modify and expand upon this code to fit your specific requirements and design preferences.