I wanted a very stripped down/simple diary app that was password protected, and this gives me ALMOST everything I want. As someone posted earlier, it would be nice to have a password hint or recovery option JUST in case. The other thing that I think would be nice is to add the option to have the app require a password if you navigate away from the app or its been for a certain amount of time. As far as I can tell, as long as the app is open, it wont require the password again, and I wish it wasnt like that, but overall its not a huge deal, especially for the price.
The second thing I would suggest is to create a blank space margin at the bottom of the text box so once you reach the bottom of the text box youre not typing RIGHT next to the text resizer; its very distracting.
One more thing I would add is the ability to create more categories or tags than just the color coding--I can make do with it, but if options are added in the future, that would be handy. I look forward to future versions!