This seems be a nice exploration game. I like the planet visuals and the background.
To me the controls where a bit too responsive, and I have the feeling the gravitational force might not be implemented correctly, but I can't say for sure. Sometimes, though, I have gravity set to maximum negative and still pass by planets more or less unaffected. The overview could be better at times, you could maybe scale the zoom depending on the distance to the closest planet.
Regarding zoom I had a bug that caused it to not reset after leaving a planet where I stayed some time so I practically had no idea where I'm going.