Hey hey, love the game, I have a recommendation:
random skin tones, random hair colors, random clothing accessories, etc, random features which make fipets look atleast slightly different from each other.
I understand programming games and designing them takes a lot of time and effort and I don't expect this feature anytime soon, but I do think it would be an interesting addition later in the future.
Maybe modding support in the future so people can create their own fipets and share them with the community? (Doesn't need to be super advanced lol)