Well, now you have even less of an excuse. As had been suggested by a number of people, The Binding of Isaac and Blocks That Matter have been added to the Humble Voxatron Debut. All you have to do is pay more than the average contribution, which, right now, is sitting at approximately four bucks.
Four bucks gets you two of our favorite commercial indie games of the year. And, better yet, both titles recently received new content: the Halloween update for Isaac, and Cocoa Levels for Blocks That Matter.