I think the Races are fine with just 4 including us. But I read something about Races and the Sexes of Races and I thought that maybe these things are true 
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The Gek have both Sexes in one that is why they are always milling about in the Spawning Pools and you never see either male or females.
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The Korvax ofcourse have no sexuality as they are Semi-Autonomous Machine Lifeforms
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The Vy’keen have both sexes but every Male Vy’keen will joke among themselves that the Females look uglier but are the more dangerous of the species. But Dangerous doesn’t make a better Warrior (Just don’t tell that to a Lady Vy’keen). Ofcourse I am joking as all races refer to themselves as neither male nor female
3 NPC races and 1 Player Race is just right for a Space Exploration Game