Your post led me to install your app and play through 10 puzzles. The post doesn’t even show the app!
What’s the name for this sort of marketing?
I really like the interface you’ve built for completing the puzzles. Very clean - it’s very nice to not be bombarded at every screen.
Thanks very much - really means a lot that you enjoyed it, we put a lot of effort into making it.
Knowing your audience, and captivating them at grassroot level or in an unexpected place, without making it feel scummy (sometimes)?
Guerrilla marketing.
I'd say "Content marketing" [1]
1. https://en.wikipedia.org/wiki/Content_marketing