Great price for this fantastic game - all time lowest price according to ITAD. Definitely worth it and a no brainer at this price, especially if you like puzzle games.
From the website:
As if awakening from a deep sleep, you find yourself in a strange, contradictory world of ancient ruins and advanced technology.
Tasked by your creator with solving a series of increasingly complex puzzles, you must decide whether to have faith or to ask the difficult questions: Who are you? What is your purpose? And what are you going to do about it?