There is only this version of the game. I've tried to find some information related to a sequel, but it appears there is nothing available. Unfortunately, it's impossible to ask the developers to release a sequel to the game.
Only they decide if this is worth it, a new sequel will be released and it's best to stay updated with the BigFishGames website, because that's the place where all these games are released.
Here is the link in case you need it: http://www.bigfishgames.com/