Many people say that this is a rip off minecraft, but if you actually play it, the only real similarity is the whole thing about surviving while gathering resources. This game has some cool features like hellworld, bosses to fight, underground jungle, and a shitton of weapons and stuff. Minecraft is better in that the maps are so vast, mods, and its 3d. I personally like both very much.
But to answer your question, yes it kind of is the 2nd minecraft, in that its a hugely popular indie game. :]