Lunacy version 9.0.4:
OS version: Linux x86_64 & ARM
As Flatpaks have a much better distribution support, and easy integration into Flathub Store, which will guarantee much better availability/popularity of the application across distributions (like Fedora Linux, Arch Linux etc.) ,(and for Lunacy Developers) easy to migrate from, by converting DEB packages almost directly to Flatpak, and with most Linux ARM-based systems already running Flatpak, I believe Flatpak/Flathub support for Lunacy would be amazing for the app, as I do have started to enjoy the application.
I could work in a Flathub Integration if you have a permalink to a TAR-file to the application, or the DEB files itself.