1.I think the O class stars should be blue color.
The B class stars should be blue white color.
The A class stars should be white color.
The F class stars should be yellow white color.
The G class stars should be yellow color.
The K class stars should be red orange color.
The M class stars should be red color.
(The temperature of stars should be changed too):
2.Add “rogue planet” ( a planetary-mass object that orbits a galactic center directly. Such objects have been ejected from the planetary system in which they formed or have never been gravitationally bound to any star or brown dwarf.