For the time, it was amazing, but nowadays its controls just feel way too clunky compared to modern Metroid controls. Fusion and Zero Mission would improve upon the foundations this game set so much, albeit in pretty different ways. There's a reason why most Metroid fangames use Zero Mission physics. Nonetheless, it's a fun game, and there exist romhacks that make the controls less bad. It gets half a star for legacy impact / retro game pity.