Can I make the game's icon change according to certain situations in the game?

[celest chasm]

For example, when person x is at location y, the game icon is the Sun, but when person x leaves location y, can the game icon be set to the moon?

[fathom plume]

Not 100%, but try

Sets the window icon (usually displayed in the top-left corner) with an Image. To use icons in the operating system's native format, use set_native_icon instead.```

https://docs.godotengine.org/en/stable/classes/class_displayserver.html#class-displayserver-method-set-icon