Some of the controls are a bit disorienting. All observations below are from the demo:
1) When I create a goal, theres no obvious way that the goal is "created". I just press the back button? The send-comment button was where I initially tried to confirm that a goal had been created.
2) When I create a subtask, and then exit the subtask menu to get to the first task, it gives me a blank page.
I really really like the idea, but the demo is a bit too buggy