I have some suggestions for features to be added:
1)   I like the simplicity of the app.  In fact, I would like the option to make it even simpler...a setting to disable "notes" and "priority" options.  Then, when you hit the + button, there would only be one field to enter along with the "add task" and "cancel" buttons.
2)  I'm not a big fan of the way deleting works.  Currently, when you press the X button, a window opens up where you then select what you want to delete and then press delete.  I would like to be able to set it so that when I press X, the app would delete all "completed" tasks.  I would be okay with a window saying "are you sure?", where you only then have to click "yes" or "cancel", etc.  
Example:  Say I have 6 out of 10 tasks completed.  If I want to delete the completed ones, I have to recheck all of them in the delete window...this is annoying.
3)  This a big one....I would like the ability to add tasks via voice.  Press a button, the google voice action box opens, I say something, and it is added as a todo item.
If these features were added, Moogly would definitely be my goto task app.