There are a lot of things to like about Starbound. I think some of its features are better than Terraria--the grappling hook is far more interesting, and its furniture system & building diversity is incredible. But it's just fundamentally not as fun as Terraria. The environments feel one-dimensional; planets' surfaces have 90% of the work put into them, and meanwhile lava planet caves look identical to frozen planet caves. And that's not even getting into the story and worldbuilding having been thrown together kinda thoughtlessly (there is literally a subplot in the backstory about antivaxxers being right!)