Hey Tim, great game. I made it all the way to the end. :p
The game mechanic is awesome. Also pretty cool that you need to attract the iron box to block the shots.
The part where you need to pass the saw-wheels is the most frustrating one. The difficulty is fine. It just doesn't feel like you have enough control over the egg to consistently make it through those narrow gaps.
Sometimes the attraction towards the magnet seemed to be weaker and when you keep pressing the attract button, the attraction force just stops after a couple of seconds even though the animation keeps going. A little better feedback on when I'm attracting the egg and how strongly I'm attracting that (In case that varies) would have been great. For the most part it handles fine, though. Especially the parts where you manage to speed through obstacles feel great!
Also props to the art. It's pretty good for such a short time frame.
I'd be interested to see what Mark has to say about it. :)