This app should appeal to anyone looking for a new special someone. It's not a traditional dating service, but may appeal to that same audience.
It may skew towards a younger demographic (16-25), but should not be so "teen-focused" as to alienate older users.
It will target both males and females, so should not contain too much pink, red or other "girlie" colors.
The theme should combine "love" (such as a heart) and "secret" (such as a locket, padlock, key, etc.).
The app will initially target iPhones, but will be extended to Android devices at some point.