Yes the sprite had a nice attack animation and I wanted to use it even as you say it's a bit unclear.
Thanks for noticing the cooldown! Even with it the hitbox is still a little off. It's a full circle so it occasionally deflects bullets that are already past you. Lots of room for improvement!
I never thought about having a second phase for the boss, will keep that in mind for future games.
Appreciate the comments thanks for playing!