In Q2 2019 (April through June), mobile gamers downloaded a total of 11.2 billion games - mostly on Google Play.
According to App Annie's Q2 2019 App Index report, games accounted for 35% of all global downloads for mobile apps last quarter, but accounted for 75% of total customer spend. That includes both Google Play and the App Store.

https://www.gamesindustry.biz/articl...mes-in-q2-2019