2. Don't click "save" unless you mean it. Oops. You just lost your work.
Those were minor complaints, these are not.
3. Searching through the components. You must let us see what we're browsing through. You must also let us filter.
4. PCB - How do I scatter components? Or must I pluck them out one at a time?
5. No Test Point footprint! Why does nobody use test points?
6. I know someone already said grid, but, grid.
I know you like your nice clean simple no-clutter UI, but put the help text on the screen, in the margins or something. You can make it optional.