This is a stunning piece of work. I put my headphones on, turned the lights off, and lost myself in this incredible world for a brief time. I completed it in a single sitting, and anyone who defines its worth in hours will sadly be disappointed. Myself, I loved every minute. I would say it's the perfect length, and ends in the perfect place. If you thrive on discovery and wonder, and/or you have a love of magnificent old machines, I'd urge you not to miss it. I'd advise not reading any more about it, lest you dilute the experience.