I like it, but some levels like #5 you have to be meticulous or it won't work. The point is to solve the puzzles, not redo them over and over until the slight adjustments allow it to work.
It's a nice and simple game. I don't like there being advantages to people willing to play, but that's always a given in a free MMORPG. All-in-all, I like it and will keep playing it.