I'll give you more details soon, I promise. Just working my butt off on it...lol. It's not going to be super fancy, but it'll be fun, I promise...
Ok, I can't resist, I'll give an overview...
For now, the game deals only with girls (sorry anyone who wants to fatten a guy but I had enough trouble coming up with measurement algorithms for women...lol). The game is played like the Sims (in real time with the ability to pause) and 6 seconds equals one minute in the game.
You create your character by first choosing her body type. You use sliders to change the three main measurements' "Levels" between 1 and 10, with a total of 18 points allowed. So, you could have a character with Bust Level 6, Waist Level 6, and Hips Level 6, which would create a fairly evenly-distributed girl, or you could do like 8 bust, 4 waist, 6 hips, or 4 bust, 4 waist, and 10 hips...etc. This affects the distribution of weight as a girl gets bigger, so you can create busty girls or big-butted girls or hourglass girls or apple girls, etc.
Then you pick at least one and up to three traits for the girl to have, with the effect of the traits being diminished the more you pick...some examples are Submissive, Gluttonous, Lazy, Ignorant, and there are currently ten of them(will be adding more) and those traits affect her speech and her base values for her feedeeism. These values are Desire, Capacity, Metabolism, and Absorption. The levels of these values determine the dependent variables - Bites Per Minute, Arousal Strength, Stomach Capacity, Digestion Speed, Fat Conversion, and Max Stomach Stretch. I'm sure you can imagine how these other values will come into play.
Then you just talk to her, take care of her, and buy her food and other things she needs. You schedule her meals and activities, watch as she outgrows clothing or bursts it altogether, arouse her into sexual encounters, and lots of other stuff. She can be under the effect of one pill at a time, which is kind of like a booster for one of the stats, while detrimenting another. She can also be under the effect of one potion at a time (you'll buy pills and potions in the game), and potions are stronger boosters with no negative effects but shorter durations and much higher cost. She can have status effects like in RPGs (multiple at a time), except these are things feeding-related, so some of the statuses are Starving, Stuffed, Gorged, Stupor, Frenzy, and Aroused. (There are currently thirteen statuses)
Her arousal and other stats determine how likely she is to answer yes or no to questions you ask her or things you tell her to do, and also how far she will go before she refuses to eat anymore. The only way to get a girl to the ultimate level "Gorged" is to make her eat to full capacity, which is a real challenge in this game, but will raise her arousal and satisfaction to full, and cause her to pass out and get huge bonuses on Fat Conversion. So yeah, I'm trying to make it pretty in-depth...once I get the system all set up and working, then I just need to draw all the graphics...which will take a while, I'm sure, but not too long. I have a tablet for the PC to draw with, so making frames of animation and increasing weight pics will be easy. The hard part is keeping the body type accurate to the pictures