I think the latest update messed with the game, there is no limit to how much you can eat (walking and growing and walking, etc.)... maybe it's just me?
I get an 'profile error' when launching the game, by the way.
Nope that's intentional. So, your stats will only increase the first 4 times. Otherwise, you'll just digest and your max fullness will increase, but no stat growths.
Yeah that's just RPG Maker being rpg maker. It's due to NWJS portion of it. If you just close it, its fine.