Great puzzle game with a concept that revolves around the sound. You have to listen to some conversations and you had to deduct the answer to some questions. The game is a bit short, around 3 to 4 hours to beat so beware of that. Otherwise it's quite logical in its design so you just have to make sure you have all the information.
Overall I think it's a great concept and great execution of a pretty interesting idea in terms of puzzle game.