This is a really cool idea, and I can see a lot of potential for it, but it can get pretty frustrating as it. The RNG puts out a lot of unwinnable contests(6 items in 15 seconds and such) and without any numerical values on stuff like capacity and digestion rate I can't tell if the upgrades actually affected anything. And the percentage on the fullness bar doesn't seem accurate, because I can still take bites at "100%" without going into overeating, plus when I do overeat it's a mystery how long it'll last. But other than some adjustments on those things, I like it and I'm quite interested in seeing where it goes from here!
Good luck in the game jam!