Good Game
I found this game to be fairly straightfoward and addicting. An excellent puzzle game overall. I only noticed 2 things that did not work properly. When I replay the game, the "moves" counter does not reset to zero, it just keeps adding moves to the existing counter. It does reset when I close the game and re-open it. Also, the in-game link to your website does not do anything.
Despite these two minor bugs, the most important things for a puzzle game are working properly. It does change, which makes for excellent replayability. It does not lock up. Also, every puzzle can be solved. I've played this game at least a dozen times already, and there is always a solution.