newly released iPhone game tie-in, is as an interactive DLC code ($4.99) for Mass Effect 2. AppGamer.net confirms that, upon completion, Galaxy displays the following message: "Your reward for completing the game is already waiting for you in Mass Effect 2."
The so-called reward is apparently transferred from Galaxy to ME2 via an EA Account (more info), but its identity remains a mystery for now -- and perhaps until you buy ME2. Our best guess is that the reward is an enhanced weapon or armor suit designed for Galaxy's main character, Jacob Taylor, who is also a companion character in ME2, and that it's an entirely negligible unlockable for all but the most obsessive completionist. The majority of reactions in the Touch Arcade forums suggest that the game itself is just as unimportant, if not downright degrading to the franchise. Proceed with caution.