About the sounds, try to convert them into different file type. mp3, ogg, wavs. Maybe it fixes the problem with opera
I think I actually do have .mp3s only :S
My friend played in safari and the music started after 3 minutes so idk what its issue is XD
You can try to convert them into wavs or ogg!
I did .ogg and it seems to work now! Thanks :D
npnp, gl