The kitties in level 2 (DLC) now also have names when you find them similar to Cats Hidden Around the World. These are not linked to achievements! So no worries about your 100% completion. That still stays the same.
Oh and there's another free game coming up I co-publish with Devcats:
https://store.steampowered.com/app/2901140/Stray_Cats_in_Cozy_Town
Peace & Love
Patrick