Alright, having played I think the balance is in a fine spot. It's not hard to get the achievements once you know how, and once you collect all of them it's super easy to go way over the calorie amount. For new players, you can stumble into quite a few just by trying to hit maximum whatever.
The "streaming setup" is seeming like a better and better way to keep things interesting because once you've reached "max size" there's still quite a few days to go before the end of the "round". Then again, I'm spending way too much time clicking over to play this game while doing other things already.