Starbound, the side-on space sandbox from some of the makers of Terraria, has been working its way through Steam Early Access since 2013. It is now, finally, a complete game. The developers have officially released its 1.0 patch. There's also a trailer to mark the occasion:
The complete change list for the 1.0 is extensive, adding new quests, characters, crafting tools, pets, fossils, a system for monorails, crops, biomes, items, and, oh, a lot of enemies will now explode into pretty particles when you kill them.