Is it any good? I've been looking for a solar jetman type of game

Fun is fun don't get me wrong, the gameplay looks great but how long does that gameplay last? I can see almost tech milestones on the planet in the trailer but have no idea if this is a 2 hour experience or a something longer. The reviews are 60 hours then 2 hour review so it's hard to tell what the "normal" playthrough would be....

Game always stops working before I can finish the junkyard planet. When I try to go back to another planet it works the first few times then eventually I cannot select a planet, I can see them but I cannot click on any of them. If I click on the junkyard planet again then I don't have a spaceship anymore. If I load the most recent saved game it takes me back a long way before the last save (doesn't seem to show the more recent saves) and usually locks up. Help!...

Game lists having a Demo on the steam search list, but I can't find one anywhere on the actual page. Steam borked or is this working as intended?

I've just finished the Nuclear planet. Powered up the reactor and the giant antenna. Went back to the contact station and got a mission to travel to the Geothermal planet with a mission marker pointing into space. Flew into space to reach the planet selection screen but Geothermal planet is still locked. Am I missing something?...