Hmm....would you say its as good as Shadow Complex and/or Super Metroid? Super Metroid is one of my all time favorites, and because of that - I absolutely LOVED Shadow Complex. Would love to play another game along those lines.
Didn't know this game was so old but just picked it up because it's on sale for plus members. Only about an hour into it but it's a lot of fun. Action is a cross between Strider and Ikaruga if that makes any sense.