From this image here's what we can see, The aliens have:
Green Eyes
3 Fingers per hand
What looks like 3 toes per foot
They are a grey/black color (or maybe Armor)
They have gold sections on their body/armor
Their faces are visible and it appears as if their noses point upwards
Also, We know they have purple blood
so who could this possible be?
In my opinion, they are most like the Badoon
although some of the traits seen from the movie aliens don't quite match those of Badoon, I believe they are the most alike