This is a really good game, and I do mean really quite excellent. This is just a suggestion, and I have no clue if this would be possible or not. Maybe like a difficulty system? Like Standard & Hard? Sometimes I feel like I'm able to level too quickly, and obesify a town rather quickly.
Maybe it's not every cup of tea, but I think making it take longer to achieve level ups, like via more significant xp requirements (like +200, or +300 percent, or more), would make earning a level feel much more rewarding. Keep up the work, Taylor!
(and P.S., don't strain yourself on updates! We're a-okay with waiting, as it helps updates come out more polished, and doesn't leave you in a time crunch!
A difficulty system is planned by the developer!
About Skills: Some of the skills make some feedism upgrades redundant.
Some of the feedism upgrades where already replaced by skills, but basically everything that has to do with numbers, like how many calories meals have, could be skills only. Unlocking features should remian feedism upgrades.
You're right, the levelling system is due a revamp (it's not that different from how it was in the original version of the game, but a lot has changed since). I'd love to add skill trees and make levelling feel more like a journey. Imagine Feeder, Feedee and Fitness skill trees, with, say, 50 levels, and lots of decisions as to which upgrades to pick.