Glitch, trapped player.
(needs a re-worked camera system for the planet center)
If you mine straight down to the very core, but so you land on the center triangle, then mine away what’s around you & then the triangle you stand on.
Then the game starts glitching like crazy & you get stuck.
Because you have so low velocity you constantly switch side around the center of the planet, and each time you switch, then the camera rotates 180* so even if you have a jetpack, it's almost impossible to leave the way you came from, especially if the entrance hole was very small, & especially if you’re already low on fuel.
Otherwise a good game.