I was looking at the editor some more last night. Unless I'm just blind, it doesn't seem like there's an easy way to create new status effects? It looks pretty straight forward to like, add new outfits but they wouldn't affect your stats in any way. So unless you know how to mod Unity you're kinda stuck with mucus, lewd crest, breast size, and shackles.
All the animations are set for Spine (the animation app), and that seems like its the same issue. All the spine files, aside from the PNGs, are squirreled away in however Unity squishes it all together.
For the events, you can set it to check things, do a qte, or give you choices. But you can only set 3 choices so if you want something more complicated you need to make it like the chests where you have 2 choices and 1 to see the next page of 2 choices. Which is such a weird restriction.
Ah well, with a little art and writing it should be fine! Anything more complicated and it'd probably be better to just make your own game in Unity, Godot, or whatever.
Speaking of which, it looks like the developer is already well on their way in their next project - another 2D action game!