I've seen the BOG movie a couple of times and I don't think you can accurately scale those planets until you put someone or something on them. My big reason being how bill's temple looked like a simple temple until you get close and notice on just one small part of it there are forests, mountains what looks like a decent river or lake and no visible end. Calling the planets or moons hill sized seems ridiculous. Some of them had their own clouds. So either planets or large moons. That image shown before seems pretty accurate.
Still, we can wait for feats. Whether Bill's is Galaxy level or not who knows yet. All I know is they will reach supernova level sometime. Maybe in the next film?