Hello! You should make sure your work is a furry piece of art in some way, since the jam is about making a Furry Visual Novel.
However, furry is a pretty loose term and it can definitely apply to more feral looking characters. If you genuinely think what you are making is a furry game, then it's probably going to be ok!
(Also as long as your game is furry and it features a bird narratively, the bird itself does not need to be the thing that makes the game furry.)
I hope that helps!