...This is really, really cool, but...it's games like these that make me feel really, really stupid, despite knowing I'm a pretty smart guy. I'm having trouble with the second one, I have NO idea how to go about the third, and I thought I'd have a chance with the fourth, but...I'm stuck. I'm stuck, I'm stuck, I'm stuck! And I feel like I should be able to solve these!! I'm smart, aren't I?! AUUUUUUGH!! And I don't have the time to sit down and try everything I can.
Very unique concept, I love the idea! But honestly, I think it's WAY too freaking hard. I'd expect to see levels like this towards the end of a game. I'm not even going to try any of the other ones, my mood and spirit are so broken....
IMO, if your players are walking off feeling despair, you aren't given them enough to work with for your puzzles.