Original post: https://misthold.dreamwidth.org/9949.html
adjacency (2017) is a 2D abstract puzzle game where you click shapes to move colors around into other shapes. It looks like a perfect mobile game, honestly, something you can zone out to while listening to podcasts.
Has a good selection of customizable options depending on how you like to play. Like, you can turn on/off the score and par, depending on whether you feel anxious or emboldened by seeing how you stack up against the computer.
60 total puzzles; I played maybe 5 before ditching it. Love the ambient background music! (Available as a separate download, too.)
Price: $2.99
Available for Windows, macOS and Linux. I played the Mac version.