You shouldn't have any trouble finding the Play Store page online: https://play.google.com/store/apps/details?id=com.app.shakea.... I believe the Play Store shows users any app they're looking for, even if it is not distributed in your region. The store will restrict your ability to install it based on the Dev Console settings by the app owners.

App developers are allowed to restrict by location on both platforms for legal reasons. The stores do not force developers to support regions that the developers do not / cannot support.

Yes, that can absolutely prevent you from seeing it if it hasn't been made available for your region.