One of the best SNES games. Was the true starting point of the Metroid series.
Re explore the same areas again when acquired new gear to find new parts to explore. For a SNES game the graphic was great as was the sound track.
The downside the game have is there are few bosses in the game.
The game was revolutionary when it game out with it's linear story yet free to explore the world in your own pace. You don't feel restricted to go to the correct place even though you actually are.
End of the line if you didn't play it on the SNES you should buy it now.