I just wanna put my two cents in and say that the combat was not that difficult with the current patch. Especially with Olive starting at level 3 and no large groups of enemies to encounter in the beginning. And it lasted like that all the way through the Mystic Forest and the side-quest plant boss.
Though, to be fair, I did a light bit of grinding before it. Just enough to get me to level 7. And sure, I won by the skin of my teeth, but that’s mostly because I am a hoarder and simply refused to use the wine in the fight and sticked to using Adrenalines and Lesser potions. For what it’s worth, I do think that the difficulty is just right. Not frustrating, but also not something that lets you breeze through by using the same attacks over and over.
But anyhow, considering that others might not have an easy time at the last stretch of the game, I think it’s a problem that’s either solved by implementing different consumable items or by getting a new party member. Because, unless she gets some super-broken skills at a later level, she’ll be needing a buddy or two to help her out on her quest to get thin!
With all that said, my preference for weight gain in games is when it’s a reward that you gotta earn, instead of a punishment dealt to you because of you needing to go through a stupid decision, or needing to lose to an enemy on purpose. And for now, I will assume that Olive does get thin again in the middle of the story, with the added bonus of being able to go through those holes in the ground.
Anyhow! My disgustingly humble suggestion is… maybe implementing a “form” system through the story that would allow Olive to control how fat she can be at any time? Each form of hers could affect her stats (eg. Thin Form = +Agility, -Defense, Fat Form = +Defense, -Agility, etc.), or would be necessary to solve a puzzle in the area. Even better, we would need to put the effort in to unlock new and even fatter forms!
Choosing when to be fat and to what degree just seems like a nice alternative to simply forcing Olive to adapt to her fetishy circumstances, you know? But I’ll understand if you have different plans altogether. The last thing I wanna do is derail your ideas for the game by giving too many off-the-wall suggestions.