I’m trying to use Lunacy on elementaryOS 6.1, but it just opens an unresponsive, unclosable transparent window. And it stays there till I reboot my entire system.
At the moment we officially support only Debian-based Linux distributions. If the problem is not localized and affects other systems too, then we can start working on it.
I had this problem on Manjaro with the flatpack version of Lunacy 8.6.2. I installed using Snap and Lunacy now loads and is usable (although it’s still temperamental).