Too many to mention but i will reply in a somewhat different fashion, The one on one combat was addicting and it was fun exploring the local star system,but when i actually clicked on the word Starmap
i was in total Awe when what before me was a map of the Universe, immediately giving me a sense of the vastness of space and the ever so intriguing planets and intelligence, treasures, technology that i know will be out there ! !
Provided, i am prepared and that i could in Realtime (not like rts click and point) But in Real time control my ship to any star system on the map and exploring the awe of each planet entering a system, what an adventure ! and experiencing anything along the way that i might have to encounter or overcome. Fuel shortages, aliens, probes... nice screenshots cuorebrave i also liked the analysis of the planet showing me the conditions i would be facing scanning the planet.
It really gave a sense of realism, it felt like i was really out in space at any given planet deep in space probing it's conditions and actually being there knowing i might send down a ship to explore it after pondering the conditions and the reward factor and just out of pure curiosity to know what the planet looks like on the surface and what i would be experiencing there ! !
The dare, the sense of exploration and excitement ! Just as exciting as traveling to outer space to unknown star systems and unknown regions !
Here in addition to your pictures, i would add the starmap, a picture of any star system with the planets orbiting it's star.
One on One combat and of course Hyperspace travel.
a few years ago, i read about the russian Venera 9 probe that was sent to Venus by the russians, and reading about it anticipating what the lander had to "feel" as it went through the different stages of the planets atmosphere and then actually landed and take pictures, what an accomplishment for the human race, that inspiration is taken to the extreme with Star Control where you actually get to explore the Planets in the whole universe and the diverse kinds of planets you get is mind blowing !
Look at for example this latest amazing discovery : http://phys.org/news/2015-10-vista-component-milky.html
A strange planet one of many called Cepheids which varies in size and brightness at a given timespan, then you get magnetars, quasars, double star systems, different ring formations, and of course black holes and their astronomical effects, just to name a few.
Another idea that i would like to see being implemented in star control is upon entering the planet system it should slightly rotate ie the planets around the sun, and of course you want to see the planets rotate as well. This a fine touch to make it seem ever more realistic, and one has to actually catch up to a planet while it is moving in it's orbit around it's star like the real universe. There should be some stars that is difficult to get in orbit about as well, the reward when actually catching up with the planet discovering what the planet holds in store would be interesting and adventurous.