Lots of fun :) Level difficulty was a little random but I kind of enjoyed an easier level after a really twitchy one.
Thank you; I was mostly building levels in sets around certain concepts: 
This meant that the levels would generally increase in complexity as I hit the "C" variant, then get easier when switching back to "A" for the next batch. If I had a level select which displayed this to the player, I think it would make a little more sense.