The art is beautiful, the story and gameplay has such good ideas and potential ... though it was absolutely broke when a friend of mine played it on Steam a while back... I didn't get it because his warnings. Dunno if its fixed. If it is, I will buy it on GOG, which I prefer

This might help
https://www.youtube.com/watch?v=C5yuYY17DBw

It is about the Switch version but most of it should apply to the PC version as well.

Italian and Dutch seem to be missing on GOG compared to Steam, but I wouldn't be surprised if it's just one of GOG's endless errors.

The subforum for the game is also completely missing, so people cannot discuss the game. I think there are hundreds of missing or incorrectly linked subforums by now, but GOG has never done anything to fix these errors.

The last point I'm interested in are the Galaxy achievements, which for now don't seem to be there, so I'll try to contact the developers to find out if they'll add them.

Both are included in the GOG version but not listed on the store page.

Edit: There are also two french versions: French and French Canada and three for the English language: US, UK, and AU

The gamepad not work, even is a xbox controller
This problem never existed on the steam version, so I guess is com from GOG...

I'm starting to doubt that they control the games as they say, it's not the first time this has happened

Thank you for the confirmation!