Level 6 can be solved without the 2x1 piece, is that a red herring or I found an unintended solution?
Nevermind, I did briefly use it, but it was such a brief encounter that I didn't even realize it.
Oh, I think I know what you did and it's indeed an unintended solution! Very clever, nice catch. I'll fix it once I'm able to upload new builds after the jam voting ends. (Also I appreciate a lot the bug you found, thanks!)