This is a really well made game with nice polish. I like how if the white circle dies, the shadows all disappear for a second until the level resets. (You might consider having the black circle pop in result too, since it's suddenly in light.)
The one thing that stood out to me, was that while monochrome games can look nice, this one almost felt as if it needed color. Like the white and gray checkered background would look better pale blue and white and the flames could have been red and blue maybe. Not sure why, it was just a feeling that came to me as I played. Another playthrough I might feel completely different.