I built a Charades-game [1] for both iOS [2] and Android [3]. Launched last year and just recently got to around 2k a month, some months like December are of course better than let's say September because of holidays like New Year etc.

It took about 10-12 months reaching those numbers, and I'd say we still have lot's of room for improvement. It's also very low maintenance, but highly scalable. What I do is basically localise the game to as many big languages as I can, and then throw some ASO on it and hold my fingers. Haven't spent any dollars at all on the marketing otherwise.

[1] https://yangmeistudios.com/games-and-apps/charades [2] https://apps.apple.com/us/app/charades-what-am-i/id159211843... [3] https://play.google.com/store/apps/details?id=com.yangmeistu...