Looking good over there. Would be interesting to have slight randomization (which is very minor and probably not that game breaking) in a creature's stats along with the appearance to reflect further on the great variation of genetic combinations which lets natural selection take its course, where you could encounter a harvestman which has an unusually strong bite force (higher damage) compared to the average harvestmen, and vice versa. To balance this, maybe make the individuals which are stronger give a little more food in return and vice versa, and potentially limit the randomness to freeplay mode only as a setting to not break the campaign completely.