I love the pun in the title. I made it to planet 7. The margin for error was too small, and I noticed that the planet integrity also goes down when you're retracing your steps. I had a circle at the centre and then went up and down to each gem. Since that would result in the least tunneling, while your intended solution creates a lot more tunneling. The story was nice and the hints were a good addition as well.
In your dev log I heared that you were Dutch as well. Would you like to team up for the next Ludum Dare?