Bug: The game thought Unity didn't have a legal cardplay

Just kidding! I missed an effect that said Unity can't play cards! Carry on.

Are you sure that Projected Paralysis didn't get played on Unity?  She is at least tied for most cards in play from your screenshot. 

Yeah, I'm dumb. -_-

That does seem odd.

You should submit the bug using their contact form on the credits page.  (unless they've moved it)