As far as general releases go, I'll try to keep all the different versions in sync (GitHub, Google Play, TestFlight) to minimize the amount of confusion.
I would like to give a big thanks to @CTalvio for helping with the graphics and screenshots that you see on the listing page, and others for contributing to the overall project! This would not be possible without all their help. Thunder is a community-driven project, and all your contributions towards the project help shape the way it is. If you are interested in contributing to Thunder in any way, feel free to reach out!
It should be compatible with Android 13, but it may take some time to propagate through the app store since it was published not too long ago! Does tapping on the direct link take you to a valid page? https://play.google.com/store/apps/details?id=com.hjiangsu.thunder