I'm going through the publishing process for Attack of the Squares now. I'm currently waiting for someone from Desura to get back to me on the matter. As soon as they do though, and the game is set to be published on Desura, it will be completely free. Attack of the Squares will not be ad driven or cost anything at all. I have also decided against any micro-transactions in future updates/
I originally made this game as something fun for people to play on as many platforms as possible. That's my only goal. I want people to have some fun playing it. The game is designed to be played in few minute increments when someone has some moments to kill. It's not a game to sit back and play for hours on end. I regularly use games to blow off some steam throughout the day. They help me be more relaxed and kill some stress. I hope that this game would do the same for someone else.
So, as soon as it goes live, it will be free and cross platform. It is also currently available to play online.