The best example of a traditional top-down RPG with furry wg/inflation elements is The Big Fat Vore RPG: The Big Fat Vore RPG
(Don’t let the name fool you, it’s mostly inflation and weight gain. There’s only a handful of vore elements)
I’d also recommend checking out Kobold Kommandos by the same author. They do a really good job working fetish elements into an RPG setting, and both those games are a great place to take inspiration from IMO. Also just good games in general.