It's hard to buy an early access game for me these days. And by "these days" I mean this year, and last year. It seems "EARLY ACCESS WOO!" translates into: "Buy a game that will never be finished! If it is, we will be sure to make it half assed!"
I never bought Starbound. I can tell just by looking at it that it is repetitive because it's 2 D. Unless there is LOADS of content (And I mean LOADS) it will feel like a record on repeat. Even then, it still may feel that way.