Oh, I love that idea for unused ideas! I always have a lot of ideas but assets rarity and time restrict me a lot.
I like how you attach math problem and gameplay to them.
My ideas may be more about the theme interpretation, and less about gameplay because 15 days is very short if you're a lonely beginner like me with not much free time.
Also my ideas are more about feminine curves then weight, for fetish reason.
Unused ideas :
- Placing people with large curves as bumpers to make something travel from a point A to a point B. Like, you work to distribute rare alchemy ingredient quickly through an area using thick fairies. ^^You have bigger curves with later level, eventually through upgrades.
- Some big being use smaller one to get feed, but the smaller one have to climb her body to feed her, wich increase time or difficulty to climb as she grow larger. Management game to counter that and keep feeding her!
- You're some big being working to carry merchandise or letters. You upgrade to get bigger because you can carry more then, and travel between cities with less step by growing in global size (giantess growth).
- You're a plant-girl starting as small and underground, and grow bigger to reach surface and sun... And maybe after that even bigger to reach the clouds... And even bigger after for the moon...
I actually can have more but I will stop there.
Idea I am using currently (but I am blocking finding assets just for simple butt and bosom expansion) :
- You have to travel around some area, but your body grows steadily wich may block some paths, so you have to choose your route wisely!
Maybe my plan B idea if I failed to find assets:
- Some being can't travel because of his nature (plant-girl, slime-girl in a cauldron... ?) but really wanted to.. So obviously, the solution is to make her grow so part of her body would reach new countries, and technically, she's there! :P