When you're fed up with space games that insult your intelligence and violate every law of physics?

Orbiter Space Flight Simulator. http://orbit.medphys.ucl.ac.uk/

It's free. But expect a learning curve.

A serious simulator doesn't mean you can't do Kerbal style stuff with it: https://www.reddit.com/r/SpaceXMasterrace/comments/nkxxvc/starship_sn8_smoking_the_deck_of_valles_marineris/