might be me but from the boiss fight on stuff didnt seem to work.
Like at the boss fight, I enter the boos room, the ship hyperdashes past so I see like 3 frames of it before it is gone and the doors close.
that's it, nothing else happening, no enemy.
after random jumping, throwing and such without a result, I finally come to realize that the only real enemy is and always has been myself.
so i devote all my might to kill myself which is hard since you easily manage to recatch the coins flying around.
but finally I manage to slay myself, being victorious as I am, the doors open for me.
after respawn I can pass past the boss room without the doors ever closing.
in the final room is my broken ship.
which doesnt want to have me back since it took me so long to realize that all that mindless slaughter was not just and that I am the villain after all.
so the ship refuses to even let me interact with it.
TL;DR: bossfight and afterwards is buggef, Error 404 boss not found.
lo, from the room with the broken ship at the end, I can go left into the boss room.
the ship kind of peeks into the room by slowly coming in from the left, before it super dashes to the left to be not seen again until i leave and reenter the room :-D
oh and in the room 2 left from the endroom(so left of bioss fight room), you can shortly see the ships pole before again the ship hyperdashes away.
this ship is even more shy than the rarest pokemon :-D