I bought it just for the "Blocks that matter" game.
Isaac is a nice one too, but i'm not so much in action rich games. So even the "leading" app in this bundle "Voxatron" is not really for me.
But who cares. I got a really addictive game (Blocks that matter) and i supported the HumbleBundle Idea.
So thats a win-win situation.
Greetings
JoTo