Here I go recommending Evoria again, but also The Abugida Effect and Archerquest. They’re certainly more of a slow burn than the other games mentioned here but well worth checking out.
Trojan Fatty and The Stuffing Chambers are great puzzle games, Royal Banquet too if you’re open to seeing pregnancy content.
While these aren’t player WG, there’s also Hungry Elves, NPC Simulator, Unfulfilling Isekai Simulator and Take a Load Off I’d recommend (I think people get notified when their threads are linked. Sorry Chikin :p).
Re;Roundbound, Round Railroad, Project Atlas, I could go on forever lol. I’ve got over 100 games saved so I’m bound to be missing a few, and these are just the ones I can think of using RPGMaker. Maybe I should copy Krod and make my own recommendations list 
. Speaking of, Krod’s weight gain games recommendation list has a ton to search through.