The experience was really serene and enjoyable. The mandala in the thumbnail was particularly eye-catching, and I found myself waiting for it to come up in my queue. The feedback from the heart beats was clear, but I was a bit unsure about the breathing part. Specifically, I wasn't sure what the blue and green colors meant, and whether I needed to hold the key for the entire bar. It might be helpful to add some visual effects to indicate successful or unsuccessful breathing. Nonetheless, great job overall!