I like the idea of having things to unlock as incentives but the incentives will burn out quick. I think other themes or features that take longer to keep it going would be even better.
I would like a little more flexibility in defining what something is. Instead of "spend time with family" how about spend X minutes with family or drink X oz of water etc.
mommyauri about Habit Streaks: Create Good Habits, Break Bad Ones.