Thank you for your appreciation.
In fact, it was A=B who encouraged me to develop this game. I also received encouragement from Artless after releasing this DEMO. I even wrote something to thank Artless Games in my game (the Steam verison).
The copy problem should be related to browser permissions. The bug behaves differently across environments. However, since I can no longer build an HTML release due to the use of desktop-only functions, I won't be fixing this bug anymore. But the final release of the desktop version will work as expected.