Oh gosh you really are a pro at finding bugs xD
Thanks for pointing it out, the issue is gonna be fixed in the next patch. It happened because I forgot to add an event page to the door allowing you to go back inside after everything is done, so it just repeats the previous cutscene that triggers the bossfight lol
The boulder is only a shortcut tho. You first cross the swamp by taking a roundabout path through the left, but I added a boulder you can push into the water so you have a quicker way across. You only can't go back to the cabin right after the bossfight, but once you progress a little in the main story the path opens up again.
Also OMG that Shida profile pic surprised me! 😭<3