Playdead Games’ Limbo has been given a release date! It will finally see the light of day via Xbox Live Arcade on July 21, launching off this year’s “Summer of Arcade.” The asking price is 1200 Microsoft points, that’s $15 or £10.20 in real world currency. If you don’t know anything about the game, which was a winner at IGF 2010, you owe it to yourself to take a look. Email the author of this …