@C_Micah I thought I’d help out a little bit and vote :3
I like the idea so far and hope everything works out the way you hope it will 
As far as having just a few selections for the MC or other characters, that’s ok to start out with, start with one then when your happy with what you have bring in more, but you really don’t want to over whelm yourself with coding and writing for so many different things at one time, but then again that’s up to you xD
YAY! Bunnies!
Ahem cough anyway.
Another fun fact to chew on is using ‘ecosystems’ as a focal point of ‘which animals rule in a given area’ .
That sounds like a very interesting way of looking at it.
I think regarding the choice of species, you’ve only really got two major routes: predator and prey (if I’m understanding the story correctly), and you could probably get away with just minor descriptive and conversational differences (e.g. calling a rabbit “long-ears” or a boar “tusky”) otherwise.
Hey, Disney made a fortune on this theme, so why not? 
Wish you had included wolverines too, because they are cool. And no, not talking Marvel or anything, just saying. 
Just… don’t upset the Furbase. Mine fields are less dangerous than courting us.
I’m more into shape shifters but the chance to see cloven hands in a game that isn’t Legacy of Kain has my attention.
I hope your boars are heavy built instead of just fat. Well maybe a few fatties.
The first orcs I saw as a child were actually boar monsters instead of the green skinned things we see so much of now.
There was one RPG that actually combined the 2 so they had green skinned anthro pigs. I can’t recall what their abs were like at the moment.
the animal morphs sound a bit like the Japanese film “Pom Poko” and if you don’t know what that means you should look it up