P.S. I found that I can copy code by "CTRL+C", but cannot paste it to anywhere(ingame and notepad) by "CTRL+V". It may be happening only in my browser, so could you check it?
environment: windows11, google Chrome(ver137.0.7151.120)
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.