Cool concept, but there are a few gameplay/balancing issues. I definitely aggree with IceDynamix's suggestions.
A few additional notes:
- I think making the effects more obvious and rebalancing the effects would actually improve the gameplay a lot
(maybe set the color according to the color of the last ingredient, and provide a few tinted versions of certain items? however, this could come with it's own set of problems)
- I feel like it's too luck based, maybe you could guide the item spawning a bit so that there's a lower probability that the player has many of the same kind (and maybe spawn less flowers).
- I think it would be beneficial to explain how an order is scored.