The basics are here, and I mean the basics. Currently, there is no reason to purchase different poses besides the first one since customers don't have preferences. Once you have the speed up (which is cheaper than a new girl and room), there is no reason to get new rooms, since one girl can solo everything.
I like the art style, but my recommendation would be to ramp up the difficulty over time (for instance, add a fame meter that as you level it up you get more customers enter at a time) and have the customers have a preference that, if you can meet it, they pay extra (could be a specific girl/type, or pose) and props if you make customers get impatient and leave if they aren't served in time.
Also, is it just me or does the bounce just kick people out and not "replace" them with anyone?
This game could become great, but I think the "game" part needs some love alongside adding new girls/animations.