So this is how it feels to be a bullet hell boss! It is a fun way to combine Katamari with a space game. I especially like that the ships don't snap on neatly and just stay the way they first touch.
My only critique would be that at a certain point you just become a ball of death, which does feel nice, but reduces any decision making to "big ball goes brrr". Especially with the boss it just feels like two big balls of bullets and heath bouncing against each other, which is a shame after the build up to the boss.