Woah, thank you so much! In fact, I think it's the opposite, you are not lacking the ability to convey what's wrong, I think you have pinpointed the issue best and made it crystal clear, too! It's been discussed both inside the team and on our game's forums and no one got even close, but knowing the technical part works under the hood I'm 100% certain it's a bullseye. While you are right that the main reason it's so floaty is that it's made in a month (I wish I didn't have to do the script writing, sound design and all kinds of stuff in addition to coding lmao), I think your insights are super useful and it would take us a while to get there, simply because we have lost all freshness of vision after a month of testing and, really, few people are so sharp they can just nail such an issue after just playing a short demo.
Also, yep, even beating Dole Fin once, that's all there is to it right now. It's replayable like any roguelike and there are a few (I think 7 like days in a week) "days" I've put there to cycle randomly after each playthrough, but you are not actually making progress after beating Fin for now.
PS: Might sound cheesy said here but I remember you from eevee's discord, I love deckbuilders and super looking forward to playing your game (as well as some others), but currently waiting for our team to return. Hope they're back this week and we finally get there!