Very good game !
I think the art, music and sound effects are very good. The mechanics are accurate.
I think it could be better explained when it is convenient to add "special milk" to the customers (in addition to when it is expressly in the recipe).
On the other hand, I think it is easy to complete the game without the need to acquire new ingredients. It could be good to increase the price scale of the barista's upgrade; thus forcing the player to have to own more ingredients to earn more money.
It would be great to see a mechanic that includes "milk extraction machines". As well as making the milk colors useful.
I have made a review in my blog of games H (in Spanish). theerogereviewer.wordpress.com