To celebrate 1 million in sales, QubicGames are giving away free codes to Robonauts (requires US eShop account to redeem). Just sign up to their newsletter, and the code will be sent within 48 hours. (Codes are being sent out manually, so be patient! Instructions for creating a US eShop account will also be included with the code, apparently.)
Plus, anyone who owns a game from QubicGames (including the Robonauts freebie) will also receive a copy of their new game, Geki Yaba Runner Anniversary Edition, for free when it is released on May 31!
Like most games from QubicGames, Robonauts is on sale pretty much all the time! And personally I found the demo a bit boring. But free is free! And two games for free is two games for free! :)