Oh, I forgot to mention - mine just HAS to be Dizzy on the ZX. I played it with my uncle when I was wee and thought it was amazing you could go either left OR right on the screen if you wanted to. I felt like, "we can go ANYWHERE in this world!!"
Double Jump Game Comics: http://doublejump.thecomicseries.com/
Shadow of the colossus. Seriously as someone who loves the idea of element structures roaming the earth in form of giants and zelda like protagonists. I seriously cannot believe I still to this day have not played it. I even bought a Vita in hopes of being able to play it. No such luck.
Psn: IIGrimsonII (Not currently active) Xbox GT: II Krason II PC/Steam Krason
I think I was in middle school when it launched. A friend from school lived in my subdivision and had it so we would always play it at his house or he'd let me borrow it. So I never bought or asked for my own copy.