Hi there ! The game is really interesting and I love the averall ambience of it.
I've only played the demo but it felt very difficult to master the controls. For example, by holding the z button (jump and dig), if I exit a planet after digging and still press the button, it automatically jump again as soon as I touch another planet.
I felt that this feature made it very hard, as the game is also pretty fast. But the overall game design and gameplay is really great :)