This is partially a question but also partially a suggestion.
Players are likely to make tens if not hundreds of similar alien race suggestions. Some people will want to see what's out there already before suggesting an alien race themselves. So will there be a way for backers to see what races have already been proposed?
And on top of this (this is half a suggestion). Could groups of similar aliens be given developer determined macro groups that result in them being situated close to one another?
It could go something like 15 people want to make space waifu cat girls, so Dan sees the pattern and makes a Neko / Feline category, he then automatically includes them under this category to inhabit star systems within close proximity to each other and they are assumed to have a common ancestor (even if that ancestor may be long forgotten)
But when categorization occurs it can inform the player and they can opt out if they want their alien race to be a race isolate that can appear anywhere?