Eets Munchies - 64-bit
FTL - 64-bit
FEZ - 64-bit
Brutal Legend - 32-bit only
Trine 2 - 32-bit only
Mark of the Ninja - Unkown, the steam version only has 32-bit, but that's pretty normal. The Humble download is like 3GB, so it'll take a while.
Bought with bitcoin, downloaded with torrent. Some good stuff there, I've been wanting to play Fez for a while now. Great to see a Linux port of it.
If they have a game already out on Steam for Windows or even Mac, participating in a HB requires
them to release the Linux(/Mac) ports on Steam as well.
And yes - before yelling at me - I'm all for still providing DRM-free versions with separate installers.