There’s two main reasons that the game is on itch.io and not Catalog (the official store).
1. The game launched a year before Catalog did. It might have even been the first Playdate game on itch.io.
2. For the longest time the game was set to “pay what you want” which is great to get a game seen by more people and still make some money but that option is not available on Catalog. As the game matured and got more content I eventually changed it to “paid” which makes it compatible with Catalog and I hope to get it on there eventually.