No bugs to say on my end.
I would like to see this as well. Probably until there are more updates and such we might see different player models. The models and physics right now I say are very nice.
I wonder how a female caprine or a snake character would do...
If anything though, the game will seem to focus on the current rat protagonist because of the notes scattered through the map referencing her, which is fine. It all depends on the developer. I don't know if they're working alone but if they are they certainly got a growing crowd coming into this game.