I agree with a lot of what Remi is saying here, and if I could add my Two cents:
-The ingredients mostly just slow the drink making process and mostly muddy up the preview UI with quite a few of them being hard to tell apart from a glance; the example I use is Espresso, cocoa topping, coffee, and chocolate are all just different shades of brown that require a second glance to tell apart. The only ingredient that seemed worth adding, besides the boba/whip cream/ice Remi mentioned, was the tea, since it was
1. an easy to read color and
2. made any "toppings" easy to tell apart
-I think the threshold for horny ordering could be expanded on. Customers seemed to only want to order the extra ingredient when our moorista was roughly 85% full plus, which meant the only times I saw the special order were during events that capped her off or when I was ignoring capacity management. If it was closer to 70-75%, or if you really want to emphasize it, 50%, then it would feel like a bigger mechanic and not just a fun add on
- I know art takes time and money away from bug fixing or mechanical updates, so I would say little touches like changing hairstyle/color to go along with the outfit and milk color options would go a long way to giving us visual variety, and if you want to leapfrog off that, you could have a randomized pool of potential cow girls using color combinations that have a mechanical quirk to make each run feel different, like a cow girl that gets a milk spike whenever you feed her happiness chocolate, or one who consistently attracts more happiness events because she is a more bubbly, friendly person
This is a strong, fun concept that really doesn't need many more features to reach peak status, just some tweaks here and there to improve the play experience if this was the goal, but I would be equally happy to see more development and ideas come forth from this project in the future as well