Thanks for the heads up, yes it was supposed to be locked, didn't realised there was an extra step. Should be right now, even though it's really just a very basic puzzle

Just let the puzzle play! It solves itself. The invisible wall is unlocked. I think I know why. The part only gets to be locked until it is tested. If you lock and don't go to test mode, it stays unlocked.

Also, it seems like a decent idea for a puzzle, but achievement hunting got in the way. Resize the puzzle space (done just before publishing). I would also recommend removing one outlet.