More detailed instructions will be added later. For now, Debian packages (amd64 and arm64) and sources are available. This is just a preview, there's no PPA set up yet. If you don't know what to do with the files below, it means you probably have no interest in installing this Hydrilla demo anyway.
Public key for verification of signatures is the one from koszko.org.
Fingerprint: E972 7060 E3C5 637C 8A4F 4B42 4BC5 221C 5A79 FD1A