Incredibly cute MC, all round great bosses and with so many bosses, it's really a feat of characterization and design. Standing ovation for all you did here.
For me, having to do it all while keeping my mouse on top of the boss to hit them was terrible gameplay. Spinning with on top of the boss is fine, but spin ends quickly, doesnt charge quick enough to be reliable on second phases and doesn't give you invincibility, so you'll spin and die against bosses that throw a lot at once (daredevil got me multiple times with this). The shackle attack is a 1-in-3 to manage to strike the projectile and return it to the boss. But rather than make it return automatically, I just wish either the attack consumed less or no spin, so I'd not feel the attack that missed was as wasted as most of them are. Spin for a sure hit, attack for survival against the many attacks, minions and turrets onscreen. (Bosses are perfect as they are, I really just think attack and spin should be rebalanced a little to give the player some freedom to move better against them.)
Would play more, would play again.