Took me a little while to realise that I needed to keep drawing loop to loop, not start and stop again! Nice idea although the levels felt a little bit cramped and drawing without hitting something was a bit tricky for me
Did you think that the tutorial popup might've caused you to think that? The first time you loop it disrupts you with a popup that teaches about loop combos, and if you didn't read it (which is normal),then you would never tried looping again and again.