Hey, thanks for your input.
I love the eating contest idea. It's simple, fun and effective for a weight gain game. Although I think that the weight gained from the minigames should be temporary. I want this game to feel like you have an actual feedee that takes time to get fat.
Having wardrobe with purchaseable clothes is a great idea.
I have thought about different body types. I know people would love to have a choice, but the problem with this is that I already have to adjust the clothes to the weight and rig them to the skeleton so that they don't clip if the character moves.
It would be easier just to make another model for a different body type, but that would mean I'd have to also make the same clothes twice. In short it would be twice the work and twice the time.
Thanks a ton for your suggestions!