Happy to help anytime!!! As for the body types, I feel that you're still missing some more balanced "hour glass" bodies, and I guess a way to have a bigger bust on the character would be nice. (I did notice the slider for that already). Maybe a few different belly types, but I wouldn't know?
As for the audio, I think it should be a mixture of both random and related to feeding. By random, I mean like when you get bigger make the burps and farts random but also happen more often (I do think this would be hard to implement tho). In terms of feeding tho, I think it burps should happen when you eat, and farts when you digest. Maybe also make it so that when you eat it has a chance to do either or, like let's say candy has a 25%, burger 50%, bucket 75% and turkey 100%. That being said I do think that sound effects should be more of a paid release thing tho. (also didn't notice you already had sound in the game, it's really low and I just noticed it as I went back while writing this post)
I actually completely understand with the whole clipping thing it does look like a pain to manage, but if you think about it it makes sense that the bigger you get the less clothes would fit you XD XD. If I may request something tho, could you add a thong option as a clothing item, something like the underwear but it can't even cover the ass.
As for the npc thing and where to put them, I think it would be pretty cool to just have like a pig pen thing where you're able to feed them (or just one but make them massive). Also I do think it would be neat that in order to get access to the Founder you would have to "sweet talk" your way through Stacy 😉😉. That being said, the feeding of multiple characters might just stem from the fact that I do kinda miss being able to feed multiple people from Virtual Gainer 1
Oh and I forgot to include this in my original post, but I do think there are too many roofed areas in the game, but that might just be me thing and it's not even an issue at all. Also I noticed you added a day night cycle thing, I'm a big fan of that. Also I don't know how everyone feels about the clipping I don't mind it that much, I mean hell from what I've seen of other weight gain games, you've put in so much effort in your game it's not even funny. Like most weight gain games there are are just visual novels.
Finally, would you happen to have a Patreon/discord/Twitter that I may follow, I would love to show my support there too!!! Again amazing content as always.