I have written one puzzle game for the Playdate using their SDK called One To Nine, available now: https://alancooke.itch.io/one-to-nine
I am currently finalizing a Playdate Pulp game with Beth Cooke called Fortress. Fortress will be available on itch.io (https://alancooke.itch.io/fortress) and Playdate's catalog website (https://play.date/games/catalog/) on October 8th.