The game doesn't currently have any sound or sfx, so not hearing anything is normal. I'll add it in the future for sure.
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Thank you so much for the fast answer and, for to make the BEST visual novel that I had the pleasure to play. Everything is fantastically done and beautiful. I will wait for the sound and, still, play the game anytime that an update is available. *I hope you get a prize for the best game of the year, or something like that.