It's surprisingly fun and replayable due to the casual and simple mechanics, and Milky Mode offers a fun challenge that gets quite hectic around the mid/end-game. I'd love to see a debug/cheat mode to change around the growth rate and to disable the mood system so I can just look at the gal for a moment without worries of getting a game-over. Could be either implemented to unlock after beating a mode or just unlocked from the get-go. Oh and another thing I'd like to see in the hypothetical cheat menu is being able to enable events such as the "Your breasts feel strange" event since pulsating growth is something I like.
Oh and I'd love to see more challenge modes or an extra hard mode where you can't just faff about with the drink forever as the customers will grow impatient after a while. Or maybe just some other gimmicks related to her growth.
In summary a great game with a fun style that has had a lot of effort put into it.