I completed levels 1, 2, and 3. I gotta say it was getting really difficult to keep up with the time, but I found a system that was working very well. I wouldn't even look back up at the customer, always kept the camera under the counter and looked at the ticket. There I would pre-cut the garnishes and place down 5 cups, two with ice, and 3 without.
Now I could just grab the liquids incredibly fast and pour them into the cups and hand them off.
When I have to shake them up, I found out that if I violently shake my mouse side-to-side, it'll instantly shake the drinks, cutting down seconds of precious time.
I can't wait to see what else gets added to this game, like more ingredients, maybe even multiple customers at the same time, making it even harder. Having different types of drinks would be awesome too, like blended drinks, or different combos of drinks.
Overall, I quite liked the game, and the scenes afterward were pretty neat, I'd say I could definitely play this game over and over if it had a bit of randomness to it, but it's great as is as well. 10/10 game!