darktjm: I would not use a closed-source application to download games, even if they actually finally released a Linux version.
If Galaxy wasn't bloated and was just a downloader I would probably have used it, just like I happily used the old GOG Downloader.
It wouldn't bother me if it is closed source, so long as it does the job it is supposed to and well. I say that as someone who crafts my own programs or creates GUI front-ends for the likes of gogcli.exe or gogrepo.py, both of which might as well be closed source for all I can understand them outside of their command-line usage.
But GOG never replaced the old GOG Downloader with something sensible, so I had to turn to gogrepo.py and then later gogcli.exe, and because I was going to all that trouble and having to use the command-line, I developed GUIs to bend things more to my liking. So aside from resume, I now have a much better downloader for GOG games anyway.
Aside from any lack of command-line usage, I cannot see what issue there is with a downloader that is closed source. It is a scenario that is not much different to the inner workings of a DVD player or something similar, where we are for the most part unable to alter much.
A program that downloads GOG games (Offline Installers) is just a means to an end, and if you are using GOG properly, you download once, backup, and never need to do so again, except for any patches or updates. Even your browser is okay to use, if you don't mind all the extra clicking on download links, etc. You can claim that most browsers are open source, but as far as modifying them to do something different with your downloads, which I have yet to see anyone do, they might as well be closed source.