Dude, please! Language. But really glad you enjoyed the updated demo. I may release one final iteration as I've cleared up an annoying bug.
Certainly I didn't want any levels that were too difficult in the demo, not that it's exactly following a linear difficulty progression throughout the levels, but generally I want to put the toughest ones last. What each player finds difficult is quite variable too, but will you hate me for the design of some of the later levels?
Yes... yes you will. :-D