Copilotron
A blue-ringed machine that fights with a swarm of its own drones and a mix of shot patterns, behind a shield. It is the eighth of the nine bosses.
I already autocompleted your death.
The fight
Copilotron is a ringed, glowing disc that fights alongside a swarm of its own drones. It is shielded: the shield has to be broken before the boss itself can be damaged.
Its attacks mix aimed shots, spreading patterns and waves of drones, and the drones can teleport around the screen, so the safe space shifts from moment to moment.
Tips
Keep the number of drones under control, because they are what turns a readable pattern into a crowded one. Take the shield down first and stay on the move; standing still in front of the swarm is the quickest way to lose a life.