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KSP's spiritual successor Kitten Space Agency just released a free public pre-alpha
(www.youtube.com)
https://ahwoo.com/store/KPbAA1Au/kitten-space-agency
You can zoom out from a craft to the solar sytem and beyond (interstellar is on the roadmap), and it's completely smooth and seamless 
Also, I love the cat theme, but I'm very divided if I can ever stomach launching a mission with a crew based on my IRL cats 
After some investigation, I have this to report:
Yep, it's a pre-alpha.
On my machine (7600X/9060XT with 32 gigs of system ram and 16 of vram) it runs (through Lutris and Proton) real smooth and looks real pretty until it crashes.
It crashes a lot, especially if I move any graphics setting away from their defaults.
Vessels do not have collision with each other yet.
It doesn't have the magical reaction wheels of KSP, but what it does have is extremely pretty RCS effects.
Yes, it is a bigger scale solar system than KSP, looks like they're using the real solar system.