Do you need a longer observation window for academic or scientific research? Consider a Historic Data pull for either Google Play or Apple App store, with a custom time frame you specify, up to X years.
App Reviews Feed
A monthly data dump of the entirety of either Google Play or Apple App store's app reviews. Specify language with two letter language code (EN, FR, IT, etc.). This is a bulk API call, returning a streaming response with one record per line.