Cool game! I like the fact that you have to let some 'notes' pass, even if it's damn hard! I had 5 stations open, then more conveyors appeared and I was back to 3 x)
I like the visuals, the music is chill and pretty, the gameplay works fine. At first I thought the gems and the mushroom were to similar, but I got used to it, I think.
However, the conveyors are not that much on the beat which does not feel like I'd be playing the song while burning stuff. Same for the gem and the monster sounds that are not the beat. Also, I feel like the tracks are too far away from one another and my fingers are too close. I often ended hitting D to burn the second line.
Overall, this is a great idea, and it's well executed! Well done ^^