The loops as I understand from a demo app I did had to be done using a Timer. It was a football (soccer to those across the pond) app I did for signaling to the manager when players had to be rotated - never finished, but it was to give all the kids a fair crack of the whip.
If PowerApps is to appeal to the masses loops need to be made more intuitive. It's also a pain to debug. Just doesn't feel right using an "interrrupt" for a loop.
What you think?
Otherwise - I still think PowerApps is definately moving in the right direction.