I played both the browser version and the downloadable version, i'm on windows and using opera GX. the game does play sounds and music.
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i am really sorry to hear about this, but thank you so much for telling me. it honestly sounds like a bug i encountered with the newer version a while ago, but you shouldn't be experiencing this with the current version.
while i try to figure out what what this issue is, I would recommend trying to play the browser version with a different browser other than Opera GX, maybe chrome? I dont know if that would fix the issue, but it might be worth a try if you really wanted to play the game. again, i am very sorry that its not working for you 😥