The main issues I see are with the navigation bar at the top with tab functions. In terms of UI, there appears to be a different amount of rounding on each rectangular element such as the tops of tabs vs. the rounded part where it joins, and corners of text fields. There should be a better separate between toolkit and analytics because of sizing issues and unclear hierarchy. For the toolkit section, it looks messy to have buttons underneath the icons where both create the same action, the icons should be enlarged and buttons should be turned into labels and sort of combined into icon (think of a home button in an app navbar that says home under it). Also, icons in the toolkit section are too small for the navbar & are high up, they should be centered and enlarged.