The positives: I love the atmospherics - it starts as a corridor type exploration game but then the player is rewarded by vast mechanized vistas which are simply beautiful in their art deco, machine-minimalist style. The expansive area you are exploring is evocative of the vast complex hinted at in the film Forbidden Planet - mechanized perfection but no people - perhaps a society which had been destroyed by its own quest for whatever the complex was designed for. There were times I simply stood and admired the vistas which were presented to me starting at Level 8 (Big Well). The sense of scale and my own insignificance in this world were amazing - excellent use of lighting, perspective and industrial haziness - a fantastic technical achievement and a terrific use of the procedurally rendered immersive world concept.
The negatives: be prepared for frustrations - there is a lot of precision/timed jumping skill required - the fascination with this began to seriously wear off in several levels where it required repeating the level dozens of times to get the timing down, and finally wore off completely on Level 28 (Magnetic Pain) where you have to walk along a spinning turbine shaft to gain access to a tunnel. I know intellectually that I would be able to eventually master the level through repetition to get the timing down but I started to simply wonder why I was spending my time in this way and lost interest at this point. I much preferred the puzzles in the game which required logic to proceed versus the obstacles requiring dexterity and timing. I couldn't help thinking that it would have been brilliant for the authors to have provided two ways to advance - one by jumping and the other by solving a puzzle. In the case of Level 28, for instance, it would be nice to provide me the choice of either walking along the spinning turbine shaft or solving a puzzle that would stop the spin - this would make for a more satisfying experience and widen the potential audience. Fortunately I am blessed with enough dexterity to play this game but I couldn't help thinking of those who might not - I submit that this game should be more about exploration and solving puzzles rather than being nimble and quick enough to jump here or there at precisely the right time. If I ever find myself confined for a long period of time with nothing else to do, I'll return to the game.
Overall - I recommend this game just for the ability to view some of the vistas rendered in the game, but realize you will likely need to repeat levels many times in order to advance. You may even decide to give up on it as I did but don't stop before Level 8 - Big Well. This is a world worth visiting just to see it - a Cubist Grand Canyon if you will - well worth the cost of the game. Note however that I cannot speak to whether there is a satisfying conclusion to the game.