The original 2015 Starbound OST from Curtis Schweitzer is basically the definitive "staring at pixel stars at 3 AM" soundtrack. "Jupiter" in its original version has this gentle piano and string arrangement that immediately sets the tone for everything that follows.
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"Cygnus X1" and "Large Magellanic Cloud" lean into darker, more mysterious territory that makes exploring unknown biomes feel appropriately vast and lonely. "Tranquility Base" lives up to its name completely. Just still.
"Hymn to the Stars" builds with this quiet reverence that never overplays itself. The experimental battle tracks tucked at the end show a rougher side that's fun to hear alongside the polished pieces. If Terraria's cousin needed a mood, Schweitzer absolutely nailed it.