More of a "bug" than feedback here - but at the current patch (0.18), there is a bug where, with the limit removing item, if a character digests the Demoness, their digestion will be hard-capped at 20 once again, even after applying other buffs. This...isn't a huge deal, since 20 deals with every possible prey in the game currently, but it is worth noting, especially if a prey with more than 20 health, or a capacity variant of the Demoness is added later. (I'm not sure what that would even be, though...)
I think the balance changes have been very good - Making certain characters slightly easier or harder has made campaign feel a lot smoother, and the extra items help with that a lot too. There are still some preds that I tend to not pick often, but I think that's more down to personal preference - Juno and Aisha mainly. I think all the other preds are in a good place, either as a favorite or a supporting role. Even Lara being an absolute stat monster makes her useful in some runs.
Currently I think the only overpowered strategy I've found is multiple Shyla, along with several 0-1 cost Specials. I think costs should be hard capped, maybe at -1 or 0, but being able to essentially go through your entire deck for no consequences is a bit too good, especially with Plums or Digestion specials that allow you to profit points-wise off of it. This is exacerbated when you get the item that starts with 3 of your favorite pred in hand, since at that point you'd (almost) always be able to have 3 Shyla by turn 4 if you start with a 0-cost specials. I think being able to reduce the cost of really strong specials like Hypnosis, Wild Card, and Massage is enough to make her viable - Being able to profit, energy wise, is the problem, I think.
The only other possible thing I can think of is maybe adding 1 or 2 more "vanilla" prey at higher health:point ratios. I suppose Elf, Healer, and Adeline serve that sort of role - but I do find getting stuck against multiple Mais, Squirrels, Princesses, and Liennes can be a little frustrating, even with dedicated Preds to deal with them. Maybe I'm just bad, though =P