My review (Sorry for my English, I'm a Spanish speaker and I'm using a translator).
It's a really interesting game, and it presents the concept of duality flawlessly, using only two buttons to execute it. Its aesthetic is beautiful, as is the music.
My only complaint is the gameplay, which becomes a bit difficult when both circles move too quickly; however, that's not difficult to correct.
That's my review. (Don't forget to review my game, too.)