Lego, Metroid & Elder Scrolls.
Okay. I'll try to break this down as logically as I can
Lego vs Minecraft
While the toy Lego is indeed similar to minecraft in the fact that it has blocks and you can build things, Being that this is a forum based around Video Games, I'm going to assume you were referring to the Lego Games. Now I don't have an absolute knowledge of every Lego game in existence, but when most people mention lego games, they are referring to the series of Video Games that are co-op beat-em-up's that feature a famous series (Star Wars, Harry Potter, etc), or the Wii U title Lego City Undercover, which is a open-world game with a similar concept as the previous titles. Minecraft is a game that would be best described as a survival sim that also allows for a creative mode to turn the world into whatever it is you feel like. They are vastly different in almost every sense.
Here is some gameplay footage from one of the first big Lego Games Lego: Star Wars
Here's some of Minecraft.
The Elder Scrolls vs Amnesia: The Dark Decent
The Elder Scrolls is a First Person RPG that allows players to explore vast, realized, fantastic worlds, whilst on an epic quest to do things with stuff (Kill Dragons, Destroy Gates, whatever you did in Morrowind), while having plentiful sidequests and skills to keep you immersed and or entertainted.
Followed by Amnesia: The Dark Decent.
A First Person survival horror tale which deliberately wants you to feel closed in and cramped, basing it's basic mechanics on being afraid of the dark, and going insane, all while being chased by creatures that as
far as I know, look nothing like anything every found in an Elder Scrolls Game.
Here's about the closest that Elder Scrolls gets to Amnesia.
and for your review, some Amnesia Gameplay,
Metroid vs Cave Story
Ok, you've got a fair point there. These games are rather similar in a lot of ways. However, it must be noted that Metroid has been copied before by AAA Developers as well. Alot of the later Castlevania games follow a formula very similar to Metroid. In my opinion, much more so then Cave Story ever does.