I think there is a glitch on level 6? The first playthrough I got a level that I couldn't solve at all. The blocks were rotated weird. I thought maybe it was a security thing, but every walkthrough has them set up the same, even though the colors are different. I started a new game and it was fine. But, the first time it was literally unsolvable.
I love this game. I come back almost everyday. Something I would LOVE to see, though, is the ability to customize your character more. Maybe different colors or something. I would love more things to upgrade, too. This game has the potential to be the perfect game, haha.