(spoilers) Continue after The Song Ending?

[Shadow Wolf]

I'm not great at bullethells but I've been steadily making my way through this game on normal difficulty but I heard the 6th boss offers an ending and I don't want to have to refight the first 5 bosses so my question is

if you take this ending can you then continue the game where you left off?

[Midnight Sky ✨🌙✨]

Nope, you start over.