So, in case it still matters, here is what I think about this demo: I am satisfied with everything.
The feline movements now feel the most satisfying and graceful all of a sudden, while mice retain their charisma in my eyes with their new skills which makes them less overpowered. It is no longer a "non-complex" "passive ability centered" faction, which is great! Now they really have an active schtick, a racial ability!
The birds now feel more graceful too, but I feel like their wing flops should be a little sharper. Now it feels too smooth, as if they were not flopping their wings with every of, say, two flops granting you some height, but launching a jetpack or opening some sort of levitation/float device that gradually raises them in the air until it dies out. I hope you get the idea. It is alright, I guess, but it feels weird.
Great work! I hope the development is good and well and we might see new updates soon! ^^