> I think an indicator of the value of the ingredient would be nice, there's like target color
This is already done! The closer you are to the optimal value, the closer the color will be to it's target color. Every "tint" is a different "task" you have not completed / completed wrongly.
> hey do this to make the value of the item doubled on a piece of paper, or something, this game felt like hiding its mechanics
The rating system is described in the tutorial. While I wanted the tutorial to be ingame, sadly did not fit that into the timeframe.