itch.io

The release published on Flathub that you're seeing through Bazaar is very old - I think it's the last open source release.

The AppImage will run on Bazzite, and you could probably also install one of the packages inside a distrobox and export it - Bazzite ships with distrobox installed. The manifest I put together and linked above is also an option and makes it pretty easy to convert your AppImage download to a .flatpak with a few commands - you only need to install flatpak-builder, which is available as a flatpak itself.

Would be great if a Flatpak repo was added as another download option alongside the distro-specific package repos. In the meantime, I put together a Flatpak manifest that can be used to convert the AppImage to a Flatpak.

https://gitlab.com/-/snippets/4881015

Download the 2.6.1 flatpak, it uses 24.08.

Looks like the icon is in the wrong place in the flatpak, so isn't being exported - it should be in /app/share/icons/hicolor/$size/apps, but is in /app/share/pixmaps (ref doc that lists the required location: https://docs.flatpak.org/en/latest/conventions.html#expected-standards).

There's also a couple of session bus issues - it requires the following  to show the status (tray) icon and have working desktop integrated media controls.

[Session Bus Policy]
org.kde.StatusNotifierWatcher=talk
org.mpris.MediaPlayer2.cider=own

Unlike the icon, you can work around this before it's fixed by adding local overrides with Flatseal or the following commands:

flatpak override --user --talk-name org.kde.StatusNotifierWatcher sh.cider.genten
flatpak override --user --own-name org.mpris.MediaPlayer2.cider sh.cider.genten