That's a really interesting and awesome future plans, I'm not a good story teller either so i don't think I can propose something good for the story, but as for gameplay features, precisely regarding stats after transformation, well, since I proposed to implement fennec into the game (which you did and it turned out adorable, so first of all I shall thank you :3) and considering the fact that you want to make health, hunger, temperature and rest, we could give fennec more resistance to different temperatures maybe (because their big ears litteraly meant for that, well actually to deal with the heat, but I doubt we will see a playable desert somewhere soon, so we can also say that big ears will help to deal with the cold, and nextly since fennecs very energized animals, i have two ideas, either they move a lot faster than other species but get tired faster or they actually get tired slower because of this, still it need testing, and because you plan to grow your game even bigger, I strongly suggest you open up maybe discord server or something like that where people will be able to share their ideas with you and reach out to your now small community, if you want I'll be happy to help! Keep up the great work! I really really love your game <