Earlier this year, Dark Nebula – Episode two was ranked second in Metacritic’s list of the most highly rated applications in the App store that were released in 2010. The average score of each application was based on reviews from various different online sites and publications, and Dark Nebula – Episode two received an average rating of 93 of out 100.   The game is also featured in the prestigious App store “Hall of fame” which is a list that Apple has put together of the 50 best applications of all time – both paid and free. This weekend the game will be completely free for everyone to download, and…