Better appdata summary
The current summary "Practice music with a regular tempo" could be better. Since the branding makes it pretty obvious what the app does I wouldn't overexplain the concept of a metronome here, and do something more interesting instead.
Some ideas:
- "Tick tock, tick tock"
- "Keep the tempo"
More general guidance here: https://gitlab.gnome.org/GNOME/Initiatives/-/wikis/App-Metadata