This game looks and sounds amazing! Very polished menus and look overall. It's very difficult to control, and the ramp-up in gravity vs distance to the gravitating body makes it hard to predict what will happen, but it was still fun to play and I kept on trying, failure after failure. I also love all the flavor text.
I've also made a gravity-sim game for Pico8. Let me know what you think of it if you get a chance!