What I mean is, I have only ever seen examples like where visual elements are manipulated. What I'd like to see is a demo of what this would look like when programming a simple, live action game. Can one live-program a moving flappy bird against a moving background? Does one need to hit the space bar while doing this in order to prevent flappy from crashing?

See also @Mikaël Mayer’s Game Programming by Demonstration (https://lara.epfl.ch/w/pong)