FRACT OSC is a midly demanding game by today's standards and any decent gaming PC from 3 or 4 years ago with at least a 1st generation i5 CPU and mid to high end HD 5850 GPU or their equivalents and up can run it smoothly. It does require 8GB of RAM for optimal experience though however 4GB can still do the job.
FRACT is a musical exploration game. You arrive in a forgotten place and explore the vast and unfamiliar landscape to discover the secrets of a world built on sound. You rebuild its machinery by solving puzzles and bring the world back to life by shaping sound and creating music in the game.