Plan for an idle clicker game made with Swift
Theme
The most successful web-based versions are based on making cookies and paperclips. This one will be based on brushing teeth. The currency generated is number of clean teeth, which can be traded into a mysterious being (later? revealed as the Tooth Fairy who wants high-quality teeth for her collection) in exchange for upgrades and helpers.
Upgrades (multipliers)
Fluoride
Electric toothbrush
Toothpaste
Floss
Helpers (idle brushers)
Dental hygienists
Dentists
Automatic car wash (repurposed)
End game
After cleaning all the teeth on Earth, buy rockets to colonize and/or discover other planets with more teeth to clean.
Other random ideas
Halloween: Dig up teeth corpses to collect teeth from the dead
Christmas: Hire elves to clean teeth. Christmas present shortage results, alas.