Yeah, Starbound was announced, during the period Terraria's development had stalled. Everyone expected Terraria+1.
Development has been slow as hell. and fairly directionless. Constantly reworking things over and over, with no clear goal for game design.
Terraria has a very tightly and complex balance of game systems. the combat, exploration, and building all work hand in hand. Hellavators, boss arenas, farming arenas, event arenas, and hotels.
Itemization is carefully designed and placed to encourage exploration into biomes.(prefab gear, in progressive gen worlds) Old biomes and areas are recycled due to events, hardmode, and boss unlocks.
Starbound is constantly at odds with itself over RNG, progressive generation, and prefab content. Boss fights are in prefab arenas, akin to Metroid/Castlevania. which IS fun.. but at odds with the building/exploration. Weapons are full rng. Armor is prefab, all crafted.
NPCS do not constantly spawn in Starbound, like they do Terraria. Digging is... empty and boring.
Quests spawn RNG from any npc. Completion gives a RNG bag, which often has a weapon in it.
Crews follow you and help. Pets the same, and can have utility items equiped on them.
Building a town. your colonists will give RNG items to you as rent periodically. What NPC spawns in a room is affected by what is IN the room. Floran items in the room, will spawn a floran npc. A table, 32 "spaces" of chest/container, will spawn a MERCHANT npc. etc, etc. check the wiki for a partial guide.
Tenant - Starbounder - Starbound Wikiits pretty complicated.
Farming is more extensive in starbound.
Tip for new players. the "flag" item, built quite early allows you to place a flag, and set a teleport location at that flag. Allows you to teleport back to that flag, from a teleporter. Very handy to drop one at your homebase, then carry a few, to drop at quest givers etc.
Cotton, and silk annoyingly rare.
Your homeworld should have cotton growing on it. Pick it, AND uproot it for the seeds. Plant it asap, in your town and start harvesting. You'll need alot.
Same with silk, via the moth trap. Get multiples of that up and running asap.
It may have changed, but biome specific monsters do exist now. These are prefab monsters. And, any given biome will have a chance to spawn 1 of these, +1 RNG monster on universe gen. These biome specific npcs DO have a chance to drop unique crafting materials. The drop is specific to the monster, NOT the biome however. So, if you need a specific item, you need to find the monster. may wish to make notes of where, you saw the unique ones, in case case you need to farm them later.