I cannot completely figure out how the mechanics are supposed to work in this game - it seems bit random what ingredients work for the biscuit at any time. But I played it twice, first my points went to minus hard, but I figured out that if I test each ingredient couple times in row and check which one effects positively, I can then just spam that one ingredient to get the "taste" to 10, 20 and even beyond. That strategy worked fairly often and on my second play I got 54 points; proof:
So yeah if the mechanics would be more clear it would be nice - you could write it in more detail in the game page. (I do not know if you meant it to be random or luck based, but I feel that mechanics with logical and fair outcomes are better than luck based but that is just my preference).
I am actually making a game where the player gathers food ingredients and my plan was, if time allows, to have different characters prefer different ingredients the player gathers and give a score accordingly. You could implement similar system perhaps; now you only have that one yellow haired guy but you could have different guys and gals with various hair and clothe colors and have them judge biscuits each differently, but consistently as per character. Just an idea...
On the artistic side. Graphics are not the most high quality but they work well from the game play perspective. One thing I would add is music, yes I think it would make it much more enjoyable. You could also have the character say different orders and replies instead of just "I want biscuit", "That was good.", etc. maybe by choosing saying from a list of sayings.
But all in all it is an ok game and you have still time to make it better.