Great game, honestly my current favorite indev WG Game, I have a couple of suggestions as follows:
I like the idea of the donut shop you've mentioned before, the idea of influencing all the town's weight with that seems really fun, any additional ways such as becoming mayor and setting WG related mandates would just be icing on the cake.
I think the idea of buying out the care facility for the immobile girls would be a good way to keep the momentum from the donut shop going even after the girls hit immobility.
Any sort of slob, vore, etc. content would be a bonus but not necessary at all.
I feel like the maximum weight of the girls should be around "warehouse-filling size." Anything beyond that would feel like each girl would take up too much focus, maybe having it so that once they outgrow the care facility you have to pay for warehouses to store and feed each one.
As mentioned before some more flavor text with the girls and around town would be nice, caught myself skipping dialogue after a point with each girl.
I'm very much interested to see what will happen with Player WG once they hit immobility and your ideas on that.
Other than that, I don't really have too much for suggestions, this is a great game so far and I'd donate to a patreon if you had one.