LISA the Painful: Definitive Edition - New Hidden Ending

A new hidden ending in LISA the Painful, in the definitive version of the game.

You can access it by sleeping at the very first campfire, near Terry's tutorial posters / Brads house. I don't know how far into the story you have to be before this ending unlocks, nor do I know if there are any criteria. I played on Pain mode, without taking any joy, and with all party members unlocked (though some had died prior).

I also don't know whether or not the boss is meant to take this long, or if I missed some key mechanic to beating him faster. Let me know what I missed!

EDIT: According to the comments and subreddit, you need to have collected all 4 boat parts before this dream sequence can be accessed via the first campfire. It can be played on both normal and pain mode. I recommend normal mode though, because if you don't have any save crows left, you have to beat this entire fight in one sitting. (If you press surrender or wipe-out during the boss, you wake up from the dream, and can then re-enter after sleeping again. Though I'm unsure whether or not Martys HP gets reset)

Also, if you want to ruin the immersion completely, you can wear the Degrading dress in this dream sequence.