If you'll excuse the pun, it's a pretty solid game.
The graphics are kind of old-school and actually remind me quite a bit of the original Fallour, and the soundtrack backs up that kind of passing of the old world into nothingness feeling you get from things in the post-apocalyptic genre. The idea of using rust and bolts with the familiar 'Select 1, 2, 3 in order' mechanic was clever and led to a nice experience.
The emphasis of the game seems to be on time trials and on playing against other people through the use of ghost replays, which was pretty okay. I enjoyed it far more for the single player enjoyment, mostly because it's not a True multiplayer experience.
Some of the levels were a little counter-intuitive (though it could just be me being incompetent), and the soundtrack, though it fit the feeling I think you were going for, did get very repetitive after awhile.
Overall, 3/3.5 for making good use of a familiar mechanic, slightly annoying music through the application of time, and the lack of a true multiplayer mode.