ok, I had a lot of fun playing around with that! :)
I tried copying several parts of what I saw in the video...
I was going to add comments explaining what is going on but ran out of time. There is a camera sprite that has scrollTo and bullet behavior that makes the screen scroll. The layout has unbounded scrolling so it can go forever. Then I move the backgound images back up to the top when they move off the bottom.
AllanR, you are the star! )
You did exactly what I was looking for! I see you like to challenge yourself, which is great! )
Now I will be examining your code, as there is lots of things going on....
Once again, Thank you so much for your help!