Can't wait to buy Lexaloffle's Voxatron? You don't have to! In fact, you don't even have to wait until the game's finished to buy it. The latest "Humble Indie Bundle" is called the Humble Voxatron Debut, and it's just that -- an alpha version of the voxel shooter, with a built-in level editor and access to all future updates.
Voxatron will cost $15 upon release, but if you get it through the bundle, it'll cost whatever you want to pay. Like all Humble games, it's Mac, Linux, and PC compatible, and proceeds go to the EFF and Child's Play in whatever proportion you want.