Minecraft is a big sandbox that will either drag you in for a long time or immediately reject you.In it, the player can reveal his creative thoughts and do whatever he wants. Starting from the construction of buildings, ending, in some kind of programming, on a redstone.
Don't ask me. Single player (for the free online version and spinoffs) is terrible. There are simply no explicit objectives. However, I've seen some people get interesting two player things going on it. I guess its a game for aspiring game developers. It feels like the empty skeleton of what could be developed into a great game, like what the developers might have worked with when developing Aground.