Hi all,
I've just finished a Space Invaders clone called Retro Invaders. It's nothing spectacular, just a short little project to learn how to develop for the Playdate using the C SDK. If you like simple, shooty, free things then you can download it from my Itch page at https://bitglint.itch.io/
Overall the development experience has been great, and pretty straightforward. Active forums really help. The C SDK is a bit lacking in detail in places, and getting the dev environment up 'n running on Windows was painful at times, but once I got going it was a really enjoyable experience.
Cheers,
Rich.