I'd love to hear Panic's reasoning on the rejection. There are currently games on Catalogue that are either completely broken and barely functional, or with barely any game to begin with.
Mini Monsters, by comparison, feels quite rich. I guess maybe no one from their crew ever had a v-pet, so they have no clue that there's tons to come with time? I mean, at a surface level glance, if you don't give it time, not much is going on. If you don't know what a Tamagochi is, you may certainly think that it feels incomplete.
But that's only to their detriment. I hope that the game manages to end up on there! And I'm very hyped for the update.