Please update tuba's Homepage in debian/control.
Tuba is a GNOME Circle app so it has a GNOME webpage:
https://apps.gnome.org/Tuba/
I think it's more helpful to show that page than a link to the git
repo.You can get to the git repo from that page by clicking Contribute
and then clicking the Code Repository link.
Tuba also happens to have https://tuba.geopjr.dev/ but I prefer the
GNOME Circle link.
You can see a list of all the GNOME Core, Devel, and Circle apps with
links to their pages from https://apps.gnome.org/
Thank you,
Jeremy Bícha