Mushihimesama Maniac All Bosses No-Miss No-Bomb

If you are aggressive enough you can skip 3 attacks on the water strider boss. Two of those attacks are not dangerous. The third can be misdirected off the side of the screen to make it easier since it is heavily affected by the boss's random movement. Ideally you want to shotgun the boss's final phase more and kill the baby striders faster so you don't have to deal with additional bullets during the final. You can misdirect nearly all of the final boss's first phase attacks which affords you extra shotgunning damage and the ability to skip one or two attacks; although, those two attacks are not remotely dangerous. It's important to get enough shotgunning damage in during the final phase to skip the enrage portion of the boss's final attack, else you will die. Best to stay close to his nose.