Avalanche is interactive fan fiction with surprisingly crisp production values. Its biggest flaw is that the interface is a bit clunky, not unlike the game it's based on (FFVII). FYI, it's WASD for movement, right shift and right ctrl to attack, spacebar to jump and confirm menu selections.
For a Final Fantasy fan still yearning for Aerith's sweet touch, despite 11 years of cosplay, spin-offs, bad CG anime and relentless forum posting, this is a must-play. It's a 300MB download, just so you're warned.