In this past, you will be in a spaceship rather than the Pilot, similar to other bullet hell games. You can still perform evasive maneuvers by dodge rolling. Your primary weapon is an automatic blaster that never needs reloading, and your active item is a rocket salvo. You can use these rather liberally as you keep damaging the HM Absolution, so fire away!
Most of its attacks are self-explanatory and if you've gotten this far, you should be able to dodge them fairly easily. Most attacks are similar patterns you've seen already, and it's capable of firing rockets similar to the Beholster that can be shot down. If you try to fly up to its side, it'll strafe that way, forcing you back down.
Two attacks of note. One is a double wide laser attack that flashes onto the screen and starts at the edges, sweeping in to the middle. You have two options here: One is to stay directly under the Absolution and dodge the shots in the middle, and the other is to dodge through the laser. You barely have enough room to dodge the laser, so you either need to be right on its edge before dodging or stick to the middle.
The second attack is when it deploys fighters on the side. There's a delay before they fire, at which point you can easily clear at least one side. This is the least you should do, as leaving a group on the other side keeps firing, but easily dodged. If you do leave them, they will eventually leave on their own.