Humble Bundle's latest 'pay what you want' deal, The Humble Voxatron Debut today graduated to bundle status with the addition of The Binding of Isaac and Blocks That Matter. Joining Voxatron, they make for a mighty fine bargain.

The Humble Voxatron Debut launched yesterday, billed simply as the first opportunity to buy Lexaloffle's voxel-tastic Voxatron. However, Humble Bundle typically adds bonus games to packages after launch, and a canny Steam user had spotted mention of today's new additions in internal Steam files.

Made by Edmund McMillen, one half of Super Meat Boy developer Team Meat, with Florian Himsl, The Binding of Isaac is a Rougelike-ish arcade shooter. It's that classic video game story: mother hears voice of god demanding son as sacrifice; son hides in basement; son defeats monsters and mother by weeping at them. It launched only in September, priced at $5.

Award-winning puzzle-platformer Blocks That Matter is another recent release, hitting PC in August. Controlling a charming little robot, you collect blocks with different properties by drilling them with your face, then lay them back down in the shape of Tetris pieces.

All three of the games run on Windows, Mac, and Linux, and today's two new additions can be added to a Steam account if you fancy.

Head on over to Humble Bundle to name your price for the Humble Voxatron Debut.