Not a game, per se; it's a procedurally-generated landscape you can walk around in. Technically impressive, although it suffers rather from being bounced down to 64px -- the resolution's just too small to properly express the design, and so the screen does occasionally feel like it's dissolving into random pixels. The audio is nicely done too. This would be an impressive base for an actual game to take place on, or done as a non-interactive art piece.