I was thinking about paying '2 more $' to obtain the new version, but I'm not very familiar yet on this website, So I don't know !
I'll check to make a changelog for the new version, but to resume, it add 3 new battle, all about the dream Succubus "Physsea" and few skill has been slighty buffed, And nerfed few heal from enemy(slighty so I guess I still had to adjust )
Viewing post in Kilgor & the Succubus World comments
I'm very sorry to say, but setting the price of the new version above the old version requires a new purchase of the full value. I wish that the purchasing methods here at itch.io were more friendly but it's not merely "pay another $2 for the new version". It ends up charging people twice.
I understand not being familiar with the process. But there's no sign anywhere that a discount like that can be applied. You'll have to manually set the price of the new version back down to $7 so people aren't paying full price and some extra for an update.