Lovely low poly inviorment, the planets are all nice. 

But it would really need some shadows, because that makes it much easier to tell how high up you are over the ground and to see how the inviorment is.

Then the way the gravity works is way to snappy, it would really need some easing. 

But the crafting system is great and the amount of planets is just right and the different types of planets have their own very specific look to them.

The gui is looking pretty good too.