This is a fantastic game, and I think more puzzle games should be like this one was!
There was a lot of backtracking to do, which is not a bad thing in this sort of puzzle game. Running around in the maze like that was a great touch, if you ask me. Most of the puzzle games I actually remember are like that. The hints were where they all needed to be for you to be able to put the overall puzzle together, you just needed to pay attention to your surroundings as you explored. Speaking of puzzles, the element one was great. It took me a little to get past the "Clicking all the switches is good and makes blocked paths open, so click all the switches" in their rooms, but when I realized what was going on after stepping on like the 3rd elemental position hint it clicked and it all fell into place nicely after that. Heh, I saw how I was going to have to finish the very last room coming the moment I started deleting blocks. I foolishly tried to right click myself. Didn't work.
Taking notes is for the weak! :P