Demographics: Females aged 40-60, USA. Well educated.
Examples of similar games on Facebook include Slotomania and and Caesar's.
It may make sense to incorporate simple objects in the logo, perhaps as separator between the words. For instance, Tap*Slots where the * denotes a star.
Other symbols typical for casinos, gambling and slot machines may also be incorporated. Bells, 7, cherry, bar, suits of playing cards, crown, sun, etc.
The logo must be one that can easily become a header of a website, so it has to be horizontal, ie. Tap Slots.
Designs like so:
Would NOT be accepted.
The logo should express excitement, fun, casino, yet also a classical simplicity. Something that a 50yr woman may consider a sign of quality.