"Rumor has it that Garage Games will only take multi-platform games."
Bit more than a rumor:
http://www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=5507
Bit more than a rumor:
http://www.garagegames.com/index.php?sec=mg&mod=resource&page=view&qid=5507