Nice to look at, feels good to play.
First I must say I'm not a fan of furrys for the most part, but I quickly found that I could ignore that. I remember when I first played Super Smash Brothers, and how the simplistic controls made the game more accesible, and so more exciting right from the start. FvF's two action key controls are alot of fun, and while I could say that reduces the potential for deep and complex gameplay, that's not really something you expect from flash games. This is definetly the foundation for something great, and I would be excited to see something bigger that builds on the formula.
The only reason I'm not giving a ten is because the game is small in scope. Definetly nothing wrong with the gameplay at all.