Hey, we're delighted that you enjoyed our game !
About the settingsn that's not an issue proper to your version. Some players already gave us this feedback (someone even almost had a heart attack ahah). Really sorry about that, that's what happen when you add features like that like 5 hours before the jam submission due hour, we'll make sure to be careful about stuff like that in the next jam.
For the sturdy shell, that should indeed be a bug. Our card design allow us to precise a rarity type and we might have set the bad one unfortunatly... And yes for the card in the store, you could buy them if you get an infinite money loop where you equip some money improvement cards and just sell/rebuy your cards to the merchant, money can stack up pretty quickely that way ahah ! But it's kind of a glitchy build hidden and RNG based, so not a good decision on our side... anyway, when you buy cards in the store they are not revealed in the carddex unfortunately.
And concerning your balancing ideas, they are great ! We'll check how we can improve the fishing spots spawn (maybe allow the player to fish anywhere and have fishing spots only for really rare cards ? Stuff like that).
Anyway, thanks a lot for the time you spent writing this review full of insights !