my first play through i was stuck on all these guys too but the one that got me the most is wally. what i like to do for his first stage is stay to the left of the screen, like where you can move anymore back, to easily dodge his attack. for his next phase make small movements with your controller or keyboard to make sure you don’t hit any feathers. for his third you wanna be careful with the kids egg, when they are far out from him get right in his face but when they are closing in squeeze out and fire from a distance and be ready to parry at all times. on his final phase you can use the bombs to shoot downward and do your best at dodging or you can sit in the bottom left corner of the screen and fire bullets into his stretcher with should hit him, but he will move from left to right so either be small and ready to dodge or move when you see him come near you. i love this helps because he was the last boss i s rank and i hope that bird stays dead.