First off, love the game. I would love to see certain hings in the future, like having art for the player character, or at least echo as it's easier to narrow it down (i do know this means a lot of additional art, but it's just an idea).
Another thing i'd love is if there will be some expanding on corrupting people in the bastion. Like get the opportunity to little by little corrupt the people in there and unlock certain interactions, this could maybe involve a way to be in the bastion while having 200+ corruption, since you can't be in the bastion if you're at 200+ corruption as you need to fight your way back in, but that triggers an ending. Maybe have the ability to corrupt people enough for them to come to you after you're kicked out of the bastion, enabling you to keep interacting with them (and corrupting them more, hopefully triggering some visual changes and infesting them like with Ferro). That would make having to leave the bastion not an issue. The ability to corrupt people would also tie in nicely with Lukka's arm containing it already and might have him research corruption the other way. (maybe provide a guide on how to do these things)
These are just ideas which i'd love to see, i love the game and admire all the work that's being put into it, keep up the great work.