Your repo seems to include a ZIP file with a copy of all the files already in the root. That ZIP is included in the Packagist download. It's not very big so no significant impact but you could remove it to reduce the size of your package.
Your license file mentions FriendsOfFlarum and Flagrow, but I don't see any code from either of those developers included. If there's indeed no code from them you can remove those lines and maybe add your own name to the license 😉
Congrats on your first extension!
