Re-reading all of the website text, as obsessive MMO players do, it finally clicked that each "race" has a home planet (my first clue should have been the planets artwork ... and then this little tidbit caught my eye today:
"Stake your claim to free land in the open world, secure it from your enemies and start your own cultivation and livestock business. Your products will never be in low demand since access to food and water is essential for survival, especially when venturing into long extra-planetary travels."
For some reason, until now, I didn't put 2 and 2 together! I take it this means that resources (and other things) harvested from one world could be in-demand (and transported) to another world via some mechanic or system?
Maybe I'm reading too much into it... but I'm liking the way this is going