Just a few tips that I think might help and that I believe aid in the interface design. The human eye looks for order so if your elements are misaligned, subconsciously we may think it looks a bit quirky. I have taken some small section screenshots from your public dev. link above to show some of these points. This can go a long way towards making things look just right. On the other hand, to make things beautiful, consider a graphic designer, I have worked with a few over the years. Someone like that can make your users go from liking your app. to loving it. Best of luck.
Notice the boxes inside the red box are misaligned by a tiny bit
While the repeating group on the left may look too cluttered, consider reducing the number of items you can see at one time. Unless you are trying to show lots of items at the time for practical reasons.
Notice how your text are in uneven planes. Work to get your content aligned horizontally where it makes sense.
Notice how your blue buttons are not in the same vertical alignment
Your text above starts just a little bit after the left side of the button
Notice again where your boxes are miss aligned.
Consider making the multiline input the same height to align the top of the top-left box and the bottom of the bottom-left box.
One thing that helps a lot is to group items that go together (right-click group items) that way you can align them to the edges and things get organized faster.
UX is also about application flow and navigation. This I could not see in action. You want this to be intuitive in order to reduce confusion and learning curve.
Let me know if this helps. Hope you can get the point where your users love your app.
Feel free to contact me at any time…