I think it would be good to add break animation for all the bosses when you got time. It feels like the bosses without the animation are lacking something compared to the other bosses. As a result, it doesn't feel as fun/satisfying when you've taken out a good chunk of their health and they lack the animation to go with it.
It would also be nice to add the face for all the bosses when the animation occurs. Otherwise it feels strange and inconsistent that only Dorlly has it when her break animation occurs. Don't worry about time and people who keep asking when the game will release. It's better for a game to be polished and complete, rather than rushed.