Terraria is more of an action adventure game. Yes you have to survive by building a base and preventing monsters from overruning you, but you explore to gain materials for crafting better gear and weapons (like flaming boomerangs, laser guns, light sabers, etc) for your character. It's like Zelda in that respect, if Zelda had crafting in it. Getting certain levels of gear allows you to explore new areas like the jungle, summon bosses like a giant Eyeball with teeth that tries to eat you, and eventually gives you access to a dungeon by defeating another boss.
Basically you explore, you build, you get gear, you kill bosses, you get better gear, explore new areas, kill harder bosses, repeat until you unlock hard mode which further complicates this idea.
It is available on the PC and is frequently on sale through Steam. The Xbox version, if I recall, has a little bit more content, but it's really not worth it to ruin the gameplay from using a controller.