I spent 2018-2019 making a puzzle game in my spare time. Revenue model was opt-in ads. Released for iOS and Android. Didn't do a ton of marketing, but that's okay, it was just a little passion project that I hoped might gain some traction.

Got up to around 70 installs peak, made $6 my first year on Android, and $14 my first year on iOS. Which is to say I made -$80 total since I had to pay $100 to publish in Apple's App Store. I cancelled the iOS app since it wasn't making enough to pay the annual $100 fee, but the Android one is still up[0] and makes ~$1 every couple of months.

Now I'm just waiting for a twitch streamer to pick it up and turn me into an overnight millionaire like "Among Us"!

[0] https://play.google.com/store/apps/details?id=com.umvirate.e...