FWIW I just tried on KDE (built from source on NixOS) and had some weird cursor dpi issues and GDK errors. Looks like it is tailored more for GTK-based DEs for now.
all GTK apps have the weird cursor issue on KDE if you're using scaling - I believe it's due to how GTK (and GNOME) handles fractional scaling as compared to QT (and KDE). Install the Bottles Flatpak and you'll see the same issue.