What about non-space games? Any recommendable ones there?
Well, despite stating that I never liked it that much personally, I would also recommend having a look at LockOn: Modern Air Combat.
It's a really nice combat flight sim that isn't too hard to learn, not as difficult to learn as a straight up "study sim" like Falcon 4.0 or anything like that at least.
It's not as easy to get into as Ace Combat or HAWX of course and still has a much steeper learning curve than either of those games, but it's not too bad.
I would also recommend IL-2 for similar reasons. Again, there's nothing really bad about these games and I only dislike due to personal tastes.
On the complete opposite end of the spectrum you have hardcore "study sims" with textbook-like manuals like the Digital Combat Simulator series (DCS: Blackshark, DCS: A-10, ect.) and Falcon 4.0 which pretty much teach you to fly the actual aircraft in a much more literal sense.