"Ohhhh. That's really clever," were the words uttered by my mouth as I realised The Fourth Wall's conceit. And then I realised I was going to have to try to explain it with words.It's a 2D sometimes-side-scrolling platformer from DigiPen student group Pig Trigger, in which you can control the character and the scrolling of the screen. So, run left or right and the screen…