Yeah, you’re right it is pretty linear. Astroneer is fantastic regarding freedom, I totally agree. And I love that it doesn’t have the food and water requirements, just air. That really lets you focus more on the exploration. Haven’t played the other two you mentioned. I’d definitely say Forever Skies is a casual game. If I weren’t playing that at night, I’d probably be playing Boggle Plus or Dr. Mario on the GameBoy. If I had the time (not at 11pm) to really get into a game where I cared about story or interesting mechanics, I would be playing something better. I could finally finish F.E.A.R., after 20 years. Or start MechWarrior 5.
All of those are true. But I still love it. Why? I like airships. And I like that I take my whole home with me as I explore, and don’t have to travel back to a fixed point to store my treasures. Is it derivative? Yes. Is it repetitive? Yes. Does it tick all the boxes for me to relax for a couple hours at night? Absolutely.