An Untitled Story. Really cute and hard platformer for PC, free, but the guy stopped making that kind of thing. In particular the soundtrack was great.
If I was to cheat, Legend of Zelda for NES. It never did get a direct sequel, i.e. a nonlinear action RPG. Lttp feels a lot different - easier, linear, and more puzzles. Ocarina was a different game altogether and everything since has been like Ocarina.







