I agree with the feedback you have already received - the game is beautiful and very original but the gameplay makes it hard to appreciate the beauty. Also I feel the gameplay is somewhat similar to a rythm game, but instead you get fooled because the music and tapping have no correlation.
Have you tried taking the game to a publisher? Preferably someone who publish games with aesthetic focus (like for instance Anapurna Interactive)? They might be interested enough to help you iron out the wrinkles because it is a truly unique game.
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