These bunnies are so cute, I wish I could see my whole collection all at once hanging out on the grass. I got a kick out of seeing that "slime" and "slug" bunnies were named that way and it made sense of the visual design. I liked the animations for feeding, bathing, etc, too.
I ended up with four types of bunnies, and I wasn't sure if there were more or if I got unlucky with my captures and evolutions or something.
There's always a lot you could add and polish with more time, but you definitely hit the jam theme!
For the viewport issue, for your next build after the jam is over try Godot project settings -> display -> window -> stretch mode -> canvas_items.