I'm currently working on a game called Star Gazer. Unsurprisingly it's set in space and you have to save Earth (also not that surprising in a Video Game) by finding a new planet for humanity to live on, by collecting clues and probes along the way. Where I think it's different is in the way you move about in the Levels. A GIF is probably better than an Explanation.
In a lot of other Space Games you'll have a beautiful, slick spaceship that can fly freely in space, where as in reality you have the moon rover and months and months of calculations to find the right landing/take-off location and time.
For the sake of fun I've taken calculation out of it but the concept is pretty much the same: You'll have a clunky vehicle that you can drive on planets which you will have to position right to boost yourself into space and and get to other planets. In space the fuel of your rocket propulsion is limited and the exhaust is mounted to the bottom of the vehicle so that you'll have to maneuver carefully in order to no land head first on the next planet (which will result in an explosion).
You can check out the current build at itch.io:
Or check out some Gameplay GIFs: