Odd. I just looked it up and it does seem sound for GDevelop games and sometimes on Safari (and ios) in general often does not work. It might be due to a a feature on by default, which "prevents automatic audio playback while browsing websites." I found some instructions on how to disable it on a website called Hippo Video. No idea if that will allow sound to work for you. Apparently this is a pretty prominent issue and I never even knew it existed until now. I should look into ways to circumvent this. Thanks so much for letting me know!