Just like before.
This game is just like the original, which is good. New puzzles and a few new features is all you needed to improve on the original, and that is exactly what you did. Keep it up.
P.S. Those of you complaining about lag, lag is caused by the computer that is PLAYING the game, not the computer that made the game or the game itself. If you don't want it to lag, get a faster computer.