Did you make servers or does the online stuff run on built in gdevelop stuff, also a cool feature you could add is maybe when clicking on someone's name you view their profile and can see their icons, stars, levels etc.
yes I made the servers I used gdevelop's built in api stuff some action where u could send and recieve data from a web page. I have a bunch of php files and the client sends get and post requests to get stuff idk I made all of it when i was in like 8th grade o_o also I probably should add profiles u right