Sure! Here's an example of a simple Hello Kitty-themed subway surfer game implemented as a single HTML file using JavaScript and enclosed in script tags. Note that this implementation is not a full-fledged game but just a basic framework to get you started. You can build upon this code to add more features and enhancements.
To play the game, save the above code into an HTML file (e.g., `hello-kitty-subway-surfer.html`) and open it in a web browser. The game canvas will appear, and you can control Hello Kitty by tapping or pressing the spacebar to make her jump. The objective is to avoid the randomly generated blue obstacles and survive as long as possible without colliding with them. The score will increase over time, and the game will end if a collision occurs, displaying the final score in an alert window.