In my opinion Rappy Slots is absolutely atrocious. It desperately needs to be able to be sped up.
Please let us play multiple games at once of Rappy Slots (eg: 10 pulls / 10 games with a single spin). Or at least speed up the actual slot spin animations / etc.
Rappy Slots is not at all fun. You just press A and wait. That is it. The only possible strategy you can employ is just trying to manipulate your luck via drinks. And even that feels completely hollow most of the time.