Thanks, the feature accounted for basically all downloads. Downloads dropped considerably after the features ended, now they are very low but steady. Retention has not been very good. Right now the game is still a one-trick pony. I'm working on an update that offers a little bit more content and possibly better retention.
Edit: Android downloads are far higher than on iOS right now thanks to a few YouTubers, but revenue-wise android's still a fraction of iOS.