I'd say: Too. Many. Characters.
There are only few stories that benefit from a large cast, I don't think this one is one of them.
I like world-building and expansion of the lore... but I feel this story lost track of what it wanted to tell.
The premise had me interested, but nowadays I only check the updates to see if the original MCs appear and if their subtext romance moves along...
It just feels like they’re there so we can look at cute cat girls which isn’t a bad thing but the story started off with such promise. Now it’s trying to jam pack all these things so it’s going through arcs just to get through the next one.
The lack of emotional connection to the main characters also throws off the whole thing. The girls at Anna’s cafe feel like the only thing tying them to the others is the fact that they are Catulus. Which I know is the point of the story but the lack of depth is too obvious to ignore.
The friendships Yuki and Ayano formed with Kozue and Mimika felt organic. The inclusion of Marron highlighted how hard it was for Congenitals to find a connection with someone. Anna’s presence solidified the hardship and also created tension.
Now the tone and over all story seems to have this back and forth between showing how the mains develop, showing amusing things/cat girl shenanigans, and showing other cat girls. It’s disjointed, picking one thing at a time instead of finding a way to harmonize and do everything together if that makes sense.