Gamification in Todo App

Although there are many applications and websites to use for managing our task with a variety of features. Still, we can manage them just by simple checklists.
But, what if we add some gamification to these lists to make them more fun. So it can motivate us to do tasks quicker.
For example, add a progress bar like in games for each list, and increase user experience by completing tasks. Also, we can add experience levels to motivate users to add more tasks and do them.