I made this iOS game: https://apps.apple.com/us/app/two-birds-one-stone/id15396463... I have wanted to be able to play this game for a long time, and probably thanks to pandemic, I did the work to enable it to be shared with others. It has made a grand total of 3 sales this year, and that isn't really bothering me (the main frustration is the apple developer fee...) There is various info (including a trailer of sorts…
I have kind of the same experience with the little game I made a while back (lots of effort, but no marketing, so no sales...).
Shameless plug: https://itunes.apple.com/us/app/mayday./id956530400