I recently bought the Humble Bundle #4 and I've been having some odd problems.
It lags at the same points in 2-5 (The Big Empty), and doesn't lag pretty much anywhere else.
Bandage-unlockable characters are not unlocking.
Some text is cut off, only leaving the first letter of it.
I'm using Debian on proprietary Nvidia (generic) drivers, x86 version.
Letters being cut off:
Not sure if it's not getting data or something else in custom levels:
Flashes between these two shots, and another with an X replacing all characters that shouldn't be unlocked yet that I couldn't get (note: 22 bandages):
EDIT: I'm not sure if I should put this here or file a bug report. I don't know if it's my end or not either, so I guess this couldn't hurt.