Played 2 hours for now (veteran in SINS 1) and here is what i "feel" about game. I find it difficult in the beginning to navigate trough research, planet/system overview. You should consider add some quick tips for beginners.
By default in research section all items/groups are expanded. Change that to be an option. Subtracted groups/items as default is way to go.
Focus of planets, fleets is not so smooth. When i click on another planet to get focus on him, focus does not change, and "q" and "e" throws me back to previous planet. Then again i have to enter system view, be super precise with my selection and then quick jump on some entity selection. Often i battle with focus change and loosing time to properly manage fleet, battle, research in same time. Simply there is a lot of space to improve in this section of the gameplay.
You really, really, need to add zoom in and out with mouse middle button. Also, "ctrl+r" for quick retreat to nearest friendly planet. And if selected for one object in active fleet, that ship naturally leave the fleet. Add shortcut for health bars ("alt" key probably).
Add detailed view of your fleet. Now we have grouped view by ship type. I like that, but put option to expand even more so we can quick select on specific ship from overview.
Those SINS 1 features mentioned above are super duper important base for smooth gameplay. Other "stuff" that you already added are good. Really, really, really good. I feel the game is pushing in the right direction, but basic stuff is just basic stuff, that every game must have.
I will provide for more feedback, and maybe detailed description for focus change part.