This is super cool. My biggest annoyance off the top of my head is that the agenda view has too much white space between notes. I should not need to scroll it when I am using fullscreen mode.
Glad you like it! As mentioned elsewhere we do plan to add more configuration options to the text editor. One of the reasons we do need quite a bit of white space between notes though is that otherwise it becomes hard to distinguish where one note begins and the other ends.
Background color based on Project? And if there is more than one note for a project then gradation of the shade. Also really in the agenda view I mostly want to see checklist items so, maybe a filter that only shows checklist items (and another filter for only incomplete items)?