Good, but could be better.
Brilliant game, but has a lot of room for improvement. the majority of my time on the game was spent on unsuccessfully deleting cogs. Make it easier to delete, and I'll be happier.
Another thing is that it takes a wile to play, as, especially for the zig-zag level, I was sorting stuff out near the end that I had to wait for ages each time I tested it. If you have a 'test' function, which lets you move the yellow cog but not count it as completing the level.
Apart from this, it was a great game; just the right difficulty, good controls (apart from a bit of glitchiness), and a good game to have a level creator on.
I apologise for the essay.