This is not Metroid! I wont go in depth about technical and all that stuff, that is why we have the gamespot's reviews.
Everyone is talking about how its so similar to Metroid or even Super Metroid (it does not have the speed of super metroid at all, i mean please, be respectful about the classics, this is a great game, but come on! don't sell the greatest 2D scroll game so cheap!) , and i can see why, but it's really not that similar!
If it is, it might be to Metroid, not at all super metroid!, i actually think the gameplay is more like the old "Out of this world" or even the original prince of persia, what makes it sort of a fusion between "Out of this World" and Metroid, it have the game play of the first and the camera angle of the second, with a couple of his on tricks of course.
So...NO! it is NOT SUPER METROID, but it is still a great game with mixed styles.
Try the demo and you'll se what i mean ^ ^