The original idea was to have different types of enemies with different colors and unique thing about the. One of them was a black circle that would be hard to see while the others were various shapes. Then doing the art, I accidentally made a eye with the black circle. Then I really liked how fighting those circles were so I made all the shapes black.
Then I really like those shapes and got the idea that the eyes should be the theming around it because of the striking image of the eyes being frozen staring at you. So I made everything a eye inspired by accurate angels.