Demo?

Is the game meant to be completed with the demo? I have the demo but most of the solar systems are locked...is it still possible to complete it without it?

If by' complete it' you mean reach all the endings, of course it's not possible, it's a demo after all. I think you can get to one of the endings though.

there's at least one ending you can achieve with the demo version. (i say "at least" because there may be a super secret other ending we don't know about yet)