Among the other things, needing an internet connection to play offline games can prevent some people from playing. Not everybody has a stable internet connection. When I had crappy rural internet I’d download a bunch of games and play when the internet was down. I wouldn’t be able to play this game in that situation.
The Super key? Yes all the time to pull up the GNOME action menu and to use shortcuts. Super+E for file browser window, +B for browser, +T for terminal window I use often.