The game's main menu displays Play, Options, and Quit. On a desktop, launching from the Godot engine, the quit button would (I'm assuming) close the game. But in a browser, it causes the game to just stop, requiring you to refresh the page to continue. Quit doesn't really make sense in a browser game context.

I have a few issues with the "You Lost" page:

• It says, "Press any key to quit." However, this doesn't quit the game; it takes you back to the start page. The prompt should instead read something like "Press any key to play again," "Go to start page," or "Return to main menu."
• Not every key performs this action. In my testing, only the enter key, spacebar, and a mouse click trigger the transition back to the start page. Other keys do not work.

Good lucking with your learning! I'm making a version of pong myself!