Thanks for the feedback.

I change < to an arrow image. Thanks for pointing it out. :)

I haven't had a need to jump from one list to another in one click, but I'll definitely keep that in mind in case it becomes a problem.

I debated with myself about the colours as well. I went through several iterations, eventually I decided to focus on the tasks, while keeping the rest of the app as less distracting as possible. As a result the text for the tasks are a bit sharper and darker than the rest. The idea is to make the frequent things clear and visible, while the rarer elements hide into background.