hoteldruid doesn't show in the GNOME Software app because of these issues: https://appstream.debian.org/sid/main/issues/hoteldruid.html
To be more specific, your app icon needs to be at least 64x64. I suggest removing the .xpm icon since it's legacy and not needed any more (although it shouldn't cause AppStream problems any more). The most common license for AppStream metadata is CC0-1.0. Once those issues are fixed in Debian (and you've waited a day or two for Debian's metadata to be updated), I expect hoteldruid will show correctly in the GNOME Software app. Thanks, Jeremy Bicha
