The minimalist visuals accompany the gameplay well enough so not many remarks there.However, I felt as though the game leaned way more into the bullet hell aspect than the rhythm aspect as when I played it, certain portions such as during bomb where the circles pulse had spots on the field in which I could simply sit the heart there and wait for the entire segment to pas which took a bit away from the rhythm aspect. I think this could be solved by either adding a secondary button that needs to be pressed to the rhythm of the song or perhaps you could add score pickups in the way of where upcoming projectiles would pass through which would make it optional to grab them but at higher risk of being hit or not go for them to have a safer run. The second suggestion would need a scoring system implemented though.
As a previous comment mentioned, Eye should have been the first level displayed due to it's lower difficulty, alongside possible difficulty ratings being attached to make it clear to the player how difficult the level will be.
The OSTs are really solid for the game though so excellent work on that.