This is the big thing that makes this stand out compared to other game ideas.
Materials, planets and vehicle classes are *invented* by the player. You put a name in, and t2d figures out the rest. This both makes the game feel more personal and *drastically* cuts down on the amount of content I have to actually come up with.
In the case of planets, what they link to is procedurally picked from what already exists. There will be one physical link and 1-2 gate links.
You can't just generate things willy-nilly -- unlocking the next tier of target requires paying progressive money and each generation attempt irreversibly consumes one of the existing materials.