For people looking to mess with their save files, just find WindowsNoEditor\GrowthRPG\Saved\SaveGames
put your save file into a save editor like https://www.saveeditonline.com
And search for this:
Character Stats
If save is Sav0:
Breasts/Pecs: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 270
Legs: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 274
Muscle: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 271
Fat :Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 272
Size: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 273
If save is Sav1:
Breasts/Pecs: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 502
Legs: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 506
Muscle: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 503
Fat: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 504
Size: Value_5_80D3DDAA449D2F99D8CD81A11BDAA014 505