The time keeping is a little stressful, however. If there were a way to just show minutes, that would be less distracting overall. Maybe that is the purpose of what you are trying to do, but it would be helpful to have a configurable setting.
Although I do not know the technique, I feel like this is what the pomodoro is trying to do.
Again, I will keep using it and give you any more feedback. I hope it gets promoted to the main feed.