I was hoping to add more moons and dwarf planets but I decided to spend more time on cleaning up the APIs.  The time slider is a great idea and I think it'd be possible with the rewindable time class I created for the asset (still pending in the asset store)

Yes.  It's awaiting review right now.  Sounds like it could take a month to get there though, but I'll update the itch page once I get it through verification and it's available.

For sure.  At the moment the orbit lines are scaled based on their distance from the sun but that makes makes Pluto's line consume it.  The asset does have a rewindable time object that could slow and stop time, but I decided to go with the synchronized time for this model which uses a multiplier against the current time.  Screenshots are a great idea.

I can so envision a game where you travel between the planets and use it as a map to select the next destination...

I'm currently working on an idea that may end up turning into a 4x game or something closer to a space sim.  I'm planning to use some work I did to generate star clusters and this asset to put planets around those stars for players to explore, colonize, etc.