This game is often compared to Minecraft, and rightfully so; they are most definitely within the same genre (sandbox explore-n-build?). But Terraria is more than just 2D Minecraft. While building and mining is just as important as it is in Minecraft, much of the focus of Terraria is on its RPG aspects (upgradeable health, mana, potions, tons of different weapons and armor, bosses, and more), which definitely sets it apart from Minecraft. Currently there isn't much to do after getting what you need from the most difficult area in the game, but the devs are always looking to improve the game and look to the community for suggestions. All-in-all, a great game that shouldn't be overlooked.