Good game.
But how do you beat the second boss?
After you destroy the eyes on his wings he will leave upwards and return with 4 enemies (2 on each side).
He then spams a spiral of blue attacks downwards while those 4 normal enemies to his sides send spirals of their current colors down while changing colors randomly.
After you destroy the 4 enemies to his side the boss contniues sending down the blue spira attack in the center.
But you cannot damage him with any attack.
So is that a bug?