I want to put emphasis on issues eight and nine above - these stand out as 'bugs' as opposed to 'balance issues'. The later are a more forgivable in a fetish game, but the bugs are a bit glaring and distracting.
13 : Level 19's image is missing.
14 : One of the achievements requires getting to level 50 on something that's capped at level 5 ( 14b : I can get it to level 6, even though the level cap still shows up) (14c : The option to level up portion sizes never grays out, even after capping)
Had fun though! I got to 19 and tripled the weight from there without further results, so I'm assuming that's the endgame.